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Diclofenac 100mg Suppositories

from£30.99

  • UK licensed POM, high-strength diclofenac delivered rectally for severe acute pain and inflammation
  • Fits situations where oral treatment isn’t practical: severe nausea/vomiting, renal colic, dysmenorrhoea, acute gout, post-surgical pain, severe migraine with vomiting
  • Cardiovascular and gastrointestinal contraindications matter — active peptic ulcer, previous MI or stroke, uncontrolled hypertension, severe renal/hepatic impairment all rule out use
  • Short-course acute use only, maximum 150mg total daily diclofenac, not for chronic pain management; caution with warfarin, ACE inhibitors, diuretics, lithium, methotrexate
  • Pack size of 10 suppositories

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Diclofenac 100mg Suppositories
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Description

Product description: Diclofenac 100mg Suppositories

Acute pain isn’t just a symptom — it’s genuinely disabling. After all, severe renal colic ranks alongside childbirth for pain intensity in patient reports.

Dysmenorrhoea can prevent women from working, studying, or functioning normally for several days each month.

Acute gout flares can be so painful that even the touch of bedsheets feels unbearable.

Post-surgical pain, acute back pain, and severe musculoskeletal injuries all cause significant distress.

So effective acute pain management genuinely matters — it’s the difference between being able to function through a difficult few days and being incapacitated.

Diclofenac 100mg suppositories fit specific situations where oral treatment isn’t practical. Specifically, when severe pain triggers nausea or vomiting, when gastric emptying is slowed by pain-related sympathetic activation, or when a patient can’t take tablets for post-surgical or other reasons.

As a result, the rectal route provides reliable absorption when oral routes fail. However, honest framing matters: diclofenac is a strong NSAID with real risks. Short-term acute use for the right indication has favourable risk-benefit. Chronic use, use in cardiovascular disease, or use alongside contraindicating medications has genuinely unfavourable risk-benefit. So this isn’t a casual painkiller — it’s a specific tool for specific situations, used appropriately for short courses.

Where suppositories fit in acute pain treatment

The UK approach to acute severe pain follows a stepped path:

  • Step 1: Non-drug measures (rest, ice, heat, positioning, distraction)
  • Step 2: Simple oral analgesics (paracetamol 1g every 6 hours)
  • Step 3: Oral NSAIDs (ibuprofen, naproxen, diclofenac tablets)
  • Step 4: Combined oral treatment (paracetamol + NSAID for additive effect)
  • Step 5: Alternative NSAID routes — suppositories (like this product), topical NSAIDs, or intramuscular
  • Step 6: Weak opioids added to non-opioid analgesia (codeine + paracetamol, dihydrocodeine)
  • Step 7: Strong opioids added when needed (morphine, oxycodone, tramadol)
  • Step 8: Specialist pain management (nerve blocks, IV analgesia)
  • Step 9: Interventional procedures for specific conditions

So diclofenac 100mg suppositories typically sit at Step 5 — an alternative NSAID route when oral treatment isn’t practical. In short, they’re a specific solution for a specific practical problem within the wider acute pain management landscape.

These suppositories vs oral diclofenac tablets

Same active, different route:

  • These suppositories: 100mg diclofenac delivered rectally
  • In contrast, oral diclofenac tablets: 25mg or 50mg per tablet delivered orally
  • Both contain diclofenac sodium
  • Suppositories: work with nausea/vomiting
  • Tablets: convenient but need swallowing
  • Suppositories: reliable absorption during severe illness
  • Tablets: variable absorption if gastric emptying slowed
  • Bioavailability similar between routes (around 54%)
  • Systemic side effect risk similar between routes
  • In general, tablets fit most situations; suppositories fit specific practical problems

These suppositories vs ibuprofen

Different NSAIDs with different profiles:

  • Diclofenac 100mg: stronger analgesic effect, higher single dose
  • In contrast, ibuprofen: available OTC, lower single doses (200-400mg)
  • Ibuprofen has better cardiovascular safety profile than diclofenac
  • Diclofenac has stronger anti-inflammatory action in some conditions
  • Both work through COX inhibition
  • Ibuprofen is available OTC (up to 400mg)
  • Diclofenac at 100mg is prescription-only
  • In general, ibuprofen fits mild-to-moderate pain; diclofenac 100mg fits severe acute pain

These suppositories vs naproxen

Two commonly prescribed NSAIDs:

  • Diclofenac: shorter half-life (1-2 hours), often twice-daily dosing
  • In contrast, naproxen: longer half-life (12-15 hours), twice-daily dosing
  • Naproxen has more favourable cardiovascular safety profile
  • Diclofenac may have stronger acute analgesic effect
  • Naproxen preferred for chronic use when NSAID is unavoidable
  • Diclofenac preferred for acute short-course use
  • Both available orally; only diclofenac widely available as suppository in UK
  • In general, naproxen fits chronic conditions; diclofenac suppositories fit acute severe pain with practical route problems

These suppositories vs paracetamol

Different mechanisms, often complementary:

  • Diclofenac: NSAID with anti-inflammatory, analgesic, and antipyretic effects
  • In contrast, paracetamol: mainly central analgesic and antipyretic; minimal anti-inflammatory action
  • Paracetamol is much safer for cardiovascular and gastrointestinal profile
  • Diclofenac provides anti-inflammatory action paracetamol can’t
  • Combined use gives additive analgesic effect
  • Paracetamol available OTC and widely used first-line
  • Suppository paracetamol also available for nausea situations
  • In general, paracetamol is safer first-line; diclofenac adds anti-inflammatory action when needed

These suppositories vs opioid analgesics

Different classes with different roles:

  • Diclofenac: NSAID — anti-inflammatory action, no dependence risk
  • In contrast, opioids (codeine, morphine, oxycodone): opioid receptor agonists, no anti-inflammatory action
  • For renal colic specifically, NSAIDs are as effective as opioids
  • For inflammatory pain, NSAIDs address the cause; opioids only mask the pain
  • Opioids have dependence and tolerance concerns
  • Opioids cause constipation and sedation
  • NSAIDs have cardiovascular and GI risks instead
  • Often used together for severe pain (NSAID + opioid = additive effect)
  • In general, NSAIDs are first-line for inflammatory pain; opioids fit when NSAIDs insufficient or contraindicated

These suppositories vs COX-2 inhibitors (etoricoxib)

Different NSAID classes with different profiles:

  • Diclofenac: non-selective COX inhibitor (COX-1 and COX-2)
  • In contrast, etoricoxib (Arcoxia): selective COX-2 inhibitor
  • COX-2 inhibitors have lower GI risk (less peptic ulcer/bleeding)
  • However, COX-2 inhibitors have higher cardiovascular risk
  • Diclofenac has cardiovascular risk profile similar to COX-2 inhibitors
  • For patients at high GI risk, COX-2 fits better
  • For patients at low CV risk, either works
  • COX-2 inhibitors don’t affect platelets (unlike diclofenac)
  • In general, choice depends on individual GI vs CV risk profile

These suppositories vs topical NSAIDs (diclofenac gel)

Systemic vs local approach:

  • Suppositories: systemic delivery, whole-body analgesic effect
  • In contrast, topical diclofenac (Voltarol gel, Emulgel): local application, minimal systemic absorption
  • Topical NSAIDs have much lower systemic side effect risk
  • Topical NSAIDs work well for localised musculoskeletal pain (sprains, strains, arthritis)
  • However, topical NSAIDs don’t work for deep or systemic inflammatory pain
  • Suppositories provide systemic anti-inflammatory action
  • In general, topical fits localised superficial pain; suppositories fit systemic acute pain

Who these suppositories may suit well

This product may suit:

  • Adults with acute severe pain who can’t tolerate oral treatment
  • Adults with renal colic during vomiting phase
  • Adults with severe dysmenorrhoea with nausea
  • Adults with acute gout flares
  • Adults with post-operative pain when oral route isn’t practical
  • Adults with severe migraine with vomiting
  • Adults with acute inflammatory joint conditions
  • Adults without cardiovascular or gastrointestinal contraindications
  • Adults needing short-term treatment (days to weeks, not months)
  • Adults who understand appropriate short-course use

Who might suit other options better

Other options may suit better for:

  • Adults with active peptic ulcer or previous NSAID-induced GI bleeding
  • Adults with coronary heart disease, previous heart attack, or heart failure
  • Adults with previous stroke or TIA
  • Adults with severe renal impairment
  • Adults with severe hepatic impairment
  • Adults with known aspirin/NSAID-induced asthma
  • Adults with inflammatory bowel disease (Crohn’s, ulcerative colitis)
  • Adults with recent lower GI or rectal surgery
  • Adults with active haemorrhoids or proctitis
  • Adults on warfarin (increased bleeding risk)
  • Adults with chronic pain needing long-term management (safer options exist)
  • Adults over 65 with multiple risk factors
  • Adults in the third trimester of pregnancy (contraindicated)
  • Adults with tension-type headache (paracetamol/ibuprofen suffice)
  • Adults uncomfortable with rectal administration when oral is practical

Courier Pharmacy supply

This is a UK Prescription-Only Medicine. So supply only happens after our UK-qualified prescriber reviews your situation thoroughly. The consultation covers:

  • Your specific pain condition and diagnosis
  • Why the rectal route is preferred over oral
  • Previous treatments tried (OTC and prescription)
  • Your full medical history including cardiovascular and GI risk factors
  • Blood pressure, cardiovascular history, GI history
  • Any previous NSAID intolerance or complications
  • Current medications and any potential interactions
  • Pregnancy status if applicable
  • Age and renal/hepatic function considerations
  • Expected duration of treatment
  • Discussion of alternative pain management approaches
  • Realistic expectations for NSAID response
  • Warning about long-term NSAID use risks

In short, this isn’t a checkbox consultation — it’s a clinical assessment. So even for a well-established licensed treatment, we take time to make sure it fits your specific situation safely.

Key features and specs

  • Active ingredient: diclofenac sodium 100mg per suppository
  • Class: non-steroidal anti-inflammatory drug (NSAID)
  • Form: torpedo-shaped rectal suppository
  • Route: rectal
  • Onset: typically 30 minutes to 1 hour
  • Duration: 4-6 hours per dose
  • Half-life: 1-2 hours
  • Maximum daily dose: 150mg total diclofenac (all routes combined)
  • Typical dosing: 100mg suppository once daily (usually at bedtime), can be split with morning 50mg oral
  • Indications: acute pain and inflammation (multiple conditions)
  • Legal status: Prescription-Only Medicine (POM)
  • Licensed as: Voltarol 100mg Suppositories
  • Storage: below 25°C, in original packaging
  • Shelf life: typically 3 years from manufacture
  • Duration of use: short-term (typically days to weeks), not chronic use

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Overview

Active ingredients

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Written By
Shazlee Ahsan
BSc Pharmacy, Independent Prescriber, PgDip Endocrinology, MSc Endocrinology, PgDip Infectious Diseases

Superintendant Pharmacist, Independent Prescriber


Checked By
Safdar Ali
BSc Pharmacy

Pharmacist


Diclofenac 100mg Suppositories — Prescription-Only Anti-Inflammatory for Acute Pain and Inflammation

This is a UK licensed Prescription Only Medicine (POM) — rectal suppositories containing 100mg diclofenac sodium, a non-steroidal anti-inflammatory drug (NSAID) used for the treatment of severe acute pain and inflammation. So each suppository delivers a full 100mg dose via the rectal route, giving effective pain relief when oral treatment isn’t practical — during severe nausea and vomiting, after surgery, during renal colic, acute gout, severe migraine, dysmenorrhoea, or musculoskeletal pain. As a result, the rectal route bypasses the stomach entirely, avoiding gastric irritation that can worsen an already inflamed situation. Important: diclofenac has significant cardiovascular and gastrointestinal warnings, and is contraindicated in several conditions — so supply happens after full prescriber assessment. Available on prescription at Courier Pharmacy.

At Courier Pharmacy, we believe in treatment that fits the person — but only where it’s honest, safe, and consented to.

This page covers what diclofenac 100mg suppositories are, who they may suit for acute pain, how they compare to oral NSAIDs and other pain management options, and the practical points that matter — cardiovascular risk, gastrointestinal safety, when suppositories fit better than tablets, and appropriate short-term use.

Five key takeaways

  • This is a UK licensed POM. It is a high-strength diclofenac delivered via the rectal route for severe acute pain and inflammation when oral treatment isn’t practical
  • The rectal route offers specific advantages: bypasses gastric irritation, works during nausea and vomiting, provides reliable absorption when oral medications may not be tolerated, and delivers effective plasma concentrations without the food-related absorption variability of oral tablets
  • Cardiovascular and gastrointestinal contraindications matter. Coronary heart disease, previous heart attack, uncontrolled hypertension, previous stroke, active peptic ulcer, and previous NSAID-induced GI bleed all rule out diclofenac use. Prescriber assessment before first supply isn’t optional
  • Intended for short-term acute use, typically 100mg once daily to a maximum of 150mg total daily dose (including any oral diclofenac). Not for long-term chronic pain management — the risk-benefit profile shifts unfavourably with prolonged use
  • Practical points: insert one suppository at bedtime for many indications, or as directed by prescriber; can be used alongside paracetamol for combined analgesia; don’t combine with other NSAIDs; caution with warfarin, ACE inhibitors, diuretics, lithium, and methotrexate

Why choose Courier Pharmacy for pain treatment

At Courier Pharmacy, our approach starts with a simple idea: treatment should fit the person, not force the person to fit the system.

Dr Ada Jex-Cori

Our service is shaped by the philosophy of Dr Ada Jex-Cori, our brand pharmacist.

Dr Ada represents the spirit of the pharmacy: evidence-led, community-rooted, and willing to challenge the one-size-fits-all approach to medicine. She is named in honour of three pioneering women in science: Ada Lovelace, the mathematician and visionary; Sophia Jex-Blake, the first female doctor in the UK who fought the medical establishment; and Gerty Cori, the biochemist and Nobel Prize winner.

In our fictional world of Etherwell, Dr Ada fights against pharma’s standardised approach to medicine. In the real world, she represents what we stand for. Her view is straightforward: you are not broken. The system is. And we are here to change that.

Dr Ada Jex Cori at courierpharmacy.co.uk holding a coupon

Acute pain deserves serious attention

Acute pain is often dismissed or under-treated. Courier Pharmacy is different. So we recognise that:

  • Acute severe pain is genuinely disabling
  • Renal colic ranks alongside childbirth for pain intensity
  • Severe dysmenorrhoea can prevent normal function for days each month
  • Acute gout is one of the most painful conditions in medicine
  • Post-surgical pain affects recovery and mobility
  • Under-treated acute pain increases risk of chronic pain development
  • Getting the right acute treatment matters
  • The route of administration matters — nausea makes tablets impractical

After all, acute pain has a real impact on quality of life during the acute phase and afterwards. So our prescriber takes it seriously.

Honest framing about the rectal route advantage

We’ll be straight about when this matters:

  • Rectal route fits situations where oral treatment isn’t practical
  • Especially useful during severe nausea, vomiting, or post-surgery
  • However, for pain without these features, oral tablets often work just as well and are more convenient
  • Suppositories are more expensive than tablets
  • Some patients find rectal administration uncomfortable culturally or personally
  • Rectal route doesn’t reduce systemic side effects — it only changes delivery
  • If tablets work for you, there’s no advantage to switching

Honest framing about short-term use

This isn’t for chronic pain:

  • NSAIDs at high dose should be used for as short a time as possible
  • Risk-benefit shifts unfavourably with prolonged use
  • Cardiovascular and GI risks accumulate with duration
  • Chronic pain needs different treatment approaches
  • If you need pain relief for weeks or months, alternative options should be considered
  • Long-term NSAID use should be under regular review

Honest framing about cardiovascular and GI risks

Not everyone can safely use NSAIDs:

  • Cardiovascular contraindications aren’t a formality
  • Coronary heart disease, previous MI, uncontrolled hypertension all rule out use
  • Previous stroke or TIA rules out use
  • Active peptic ulcer or previous NSAID-induced bleeding rules out use
  • If you have significant risk factors, careful assessment matters
  • Older adults have higher risk profile
  • Alternative pain management options exist for these situations

Honest framing about paired analgesia

Combining medications often works better:

  • Paracetamol plus diclofenac gives additive analgesia
  • Better than either drug alone at maximum dose
  • Different mechanisms — no additive side effects
  • Standard approach for post-operative and acute pain management
  • Consider paracetamol 1g four times daily alongside diclofenac
  • Antiemetic can be added if nausea is prominent

Pain and the bigger picture

Acute pain often has causes worth investigating. So our prescriber can discuss:

  • Whether the pain has been properly diagnosed
  • Whether investigations might be helpful
  • Whether specialist referral is appropriate
  • Whether the pain suggests a condition needing specific treatment
  • Whether triggers can be identified and modified
  • Whether non-drug approaches would help
  • Whether acute pain is becoming chronic pain (needing different approach)
  • Whether alternative pain management is more appropriate
  • When to consider chronic pain services

Sometimes the acute pain episode is the visible part of a wider picture worth talking through.

Prescriber support before and after supply

Our team is here to discuss:

  • Whether diclofenac suppositories fit your specific situation
  • Whether the rectal route is genuinely needed vs oral tablets
  • Cardiovascular and GI risk assessment
  • Correct insertion technique
  • Duration of treatment planning
  • Combined analgesia options (paracetamol addition)
  • Gastroprotection if higher GI risk
  • What to do if pain doesn’t respond
  • When to seek urgent medical help

Trust earned, not claimed

We are GPhC-regulated, and our content is grounded in the licensed Voltarol 100mg Suppositories Summary of Product Characteristics (Novartis), NICE Clinical Knowledge Summaries on acute pain, gout, renal colic, and dysmenorrhoea, British National Formulary guidance on NSAIDs, MHRA guidance on cardiovascular risk with NSAIDs, decades of published clinical evidence on diclofenac, and the real experience of patients managing acute pain.

If these suppositories aren’t the right answer for your situation, we’ll tell you honestly. After all, getting the right treatment matters more than fulfilling a request.

How supply works

This is a licensed UK Prescription-Only Medicine. So the supply process has proper clinical steps.

How our service works

  1. Complete the detailed pain consultation on courierpharmacy.co.uk
  2. Our UK-qualified prescriber reviews your pain condition, cardiovascular status, and GI history
  3. If approved, the prescriber issues a prescription for the suppositories
  4. Your order is dispatched in plain, discreet packaging
  5. Free prescriber support is available throughout treatment
  6. Duration reviewed based on your acute condition

When other options might suit better

If these suppositories aren’t right, we’ll explain why. Other options may include:

  • Oral diclofenac tablets — if you can tolerate oral route
  • OTC ibuprofen or naproxen — for milder pain
  • OTC paracetamol — safer first-line option
  • Codeine or dihydrocodeine — if NSAIDs contraindicated
  • Etoricoxib (Arcoxia) — COX-2 selective for higher GI risk patients
  • Topical diclofenac gel — for localised musculoskeletal pain
  • Paracetamol suppositories — safer alternative rectal option
  • Specialist pain management for severe or refractory pain
  • Condition-specific treatments (colchicine for gout, antispasmodics for renal colic)
  • Non-drug approaches (physiotherapy, TENS, acupuncture)
  • A&E or urgent care for severe acute presentations
  • GP or specialist review for undiagnosed severe pain

Our community service

Our free fortnightly drop-in clinics at Insomnia, Derby run every other week from 10am to 12pm.

Healthcare shouldn’t only happen when you’re paying for it. So we show up, even when it’s free.

We cover pain management, acute conditions, migraine, headache, skincare, acne, hair loss, MCAS, weight management, menopause, women’s health, men’s health, chronic pain, digestive health, allergies, asthma, sleep, and whatever else people bring through the door. No appointment needed, no charge, no pressure.

Dr Ada Jex Cori at courierpharmacy.co.uk holding a coffee 2

Active ingredient

Each suppository contains:

  • Diclofenac sodium 100mg (non-steroidal anti-inflammatory drug — NSAID)
  • Solid fatty base (adeps solidus / hard fat) for rectal delivery

Why diclofenac

Diclofenac is one of the most widely used NSAIDs:

  • Non-selective cyclooxygenase (COX-1 and COX-2) inhibitor
  • Slight preference for COX-2 inhibition (partially explains efficacy)
  • Reduces prostaglandin production — the key inflammatory mediators
  • Also reduces leukotriene production (unlike most other NSAIDs)
  • Strong analgesic effect comparable to opioids for some pain types
  • Anti-inflammatory action addresses the cause of inflammatory pain
  • Antipyretic (fever-reducing) effect
  • Decades of clinical evidence across multiple indications
  • Well-characterised pharmacology and side effect profile

In short, diclofenac is one of the reference NSAIDs. After all, when a molecule has been in clinical use for over 50 years with consistent evidence across acute pain, inflammation, and multiple indications, it earns its place in the pain management armoury.

Why the 100mg strength

The 100mg dose is specifically chosen for suppository use:

  • Standard licensed suppository strength for adults
  • Provides effective plasma concentrations comparable to 100mg oral
  • Higher single dose than typical oral tablets (which are 25mg or 50mg)
  • Reflects the once or twice-daily suppository dosing pattern
  • Maximum daily dose 150mg (combining all diclofenac routes)
  • Suitable for severe acute pain requiring effective NSAID coverage
  • Well-established safety at this dose for short-term use

After all, the 100mg suppository dose is the licensed strength backed by decades of clinical trial evidence. So this isn't an experimental concentration — it's the standard prescription dose in suppository form.

Why the rectal route

The suppository route offers specific advantages:

  • Bypasses the stomach entirely — no direct gastric mucosal exposure
  • Works during nausea and vomiting when oral treatment fails
  • Reliable absorption during severe illness or reduced consciousness
  • Alternative when oral route isn't practical (post-surgery, unconscious patient)
  • Doesn't require the patient to sit up or drink water
  • Some patients tolerate rectal route better during severe pain
  • Overnight use provides sustained overnight analgesia
  • Bioavailability similar to oral route (around 54%)

However, it's important to be honest about what the rectal route doesn't do — it doesn't reduce systemic side effects (heart, kidneys, blood still receive the drug), doesn't avoid gastric symptoms indirectly caused by the drug (the drug still reaches the stomach through the bloodstream), and doesn't reduce interactions with other medications. In short, the rectal route is about delivery route, not systemic safety.

Other ingredients

Standard suppository excipients include:

  • Adeps solidus (solid fatty base) — melts at body temperature to release drug
  • Additional excipients as listed in the licensed SmPC

Complete excipients list is on the patient information leaflet. So mention any known allergies during your consultation.

Pack details

Diclofenac 100mg suppositories come as:

  • Individually foil-wrapped suppositories
  • Typically supplied in packs of 5 or 10 suppositories
  • Torpedo-shaped for easy insertion
  • Each suppository is single-dose
  • Sealed until use
Dr Ada Jex Cori measuring active pharmaceutical ingredients on a weighing scale courierpharmacy.co.uk

What are Diclofenac 100mg Suppositories for?

These suppositories are licensed for the treatment of pain and inflammation in a range of acute conditions. So diclofenac works by inhibiting cyclooxygenase (COX) enzymes, reducing prostaglandin production and thereby reducing pain, inflammation, and fever. As a result, it fits situations where inflammatory pain is prominent and where oral treatment isn't practical or preferred.

Who might these suppositories suit?

This product may suit:

  • Adults with acute severe pain who can't tolerate oral medication due to nausea or vomiting
  • Adults with acute renal colic (kidney stones) — NSAIDs are first-line, and rectal route works when patient is vomiting
  • Adults with severe dysmenorrhoea (menstrual pain) with associated nausea
  • Adults with acute gout flares
  • Adults with severe migraine attacks when oral treatment isn't practical
  • Adults with post-surgical pain requiring parenteral-alternative route
  • Adults with acute severe musculoskeletal pain
  • Adults with acute severe back pain
  • Adults with acute inflammatory joint conditions
  • Adults who've had good response to diclofenac previously and need alternative route
  • Adults without contraindicating cardiovascular or gastrointestinal conditions
  • Adults needing short-term treatment (not chronic use)

What these suppositories may help with

Based on licensed indications and clinical evidence:

  • Acute renal colic (one of the strongest indications — NSAIDs work as well as opioids for kidney stone pain)
  • Severe dysmenorrhoea (menstrual pain)
  • Acute gout attacks
  • Post-operative pain management
  • Acute musculoskeletal pain and injuries
  • Acute low back pain
  • Severe migraine attacks (with acute treatment protocols)
  • Acute flares of inflammatory joint conditions
  • Post-traumatic pain
  • Acute soft tissue inflammation

Important honesty point: high-strength NSAIDs work well for acute pain but the risk profile increases with duration. After all, prostaglandin inhibition affects the stomach lining, kidney function, cardiovascular system, and platelet function — the same mechanism that reduces pain also creates the risks. So short-course use is essential.

What these suppositories don't claim to do

Honest framing matters:

  • They're not designed for chronic pain management (safer options exist for long-term use)
  • They don't treat the underlying cause of pain — they manage symptoms
  • They don't work well for neuropathic pain (different mechanism required)
  • They don't provide the maximum pain relief of strong opioids for severe post-op pain
  • They're not first-line for tension-type headache (paracetamol/ibuprofen suffice)
  • They don't replace disease-modifying treatment for chronic inflammatory conditions
  • They don't work faster than oral diclofenac in most patients — the advantage is route, not speed
  • They're not safe for everyone — cardiovascular and GI contraindications matter
DR AdaJex Cori with lower back pain courierpharmacy.co.uk

How diclofenac works

Understanding the mechanism helps explain both the analgesic effect and the side effect profile.

The pain and inflammation mechanism

Prostaglandins are key mediators:

  • Tissue injury or inflammation triggers release of arachidonic acid
  • Cyclooxygenase (COX) enzymes convert arachidonic acid into prostaglandins
  • Prostaglandins sensitise nerve endings, causing pain
  • Prostaglandins increase blood vessel permeability, causing swelling
  • Prostaglandins mediate the inflammatory response
  • They also raise body temperature (fever)
  • Two main COX enzymes: COX-1 (constitutive, protective) and COX-2 (inducible, inflammatory)

How diclofenac works on the pain mechanism

  1. Suppository inserted rectally
  2. Fatty base melts at body temperature
  3. Diclofenac absorbed through rectal mucosa into systemic circulation
  4. Distributed to sites of pain and inflammation
  5. Inhibits both COX-1 and COX-2 enzymes
  6. Reduces prostaglandin production
  7. Reduces pain signal transmission
  8. Reduces inflammatory response (swelling, redness, heat)
  9. Reduces fever if present
  10. Also mildly reduces leukotriene production

In short, diclofenac stops the production of the molecules that cause pain and inflammation. After all, this is why it works for inflammatory pain but is less useful for neuropathic pain (different mechanism).

Why the side effect profile matters

The mechanism explains the risks:

  • COX-1 inhibition reduces protective prostaglandins in the stomach lining ? GI risk
  • COX-1 inhibition reduces platelet function ? bleeding risk
  • COX-2 inhibition affects vascular endothelium ? cardiovascular risk
  • Both COX inhibition affects kidney function ? renal risk
  • This is why NSAIDs have consistent side effect patterns — the same mechanism that reduces pain creates the risks
  • Short-course use minimises risk while providing benefit

Onset timeline

What to expect with the suppository:

  • 0-15 minutes: no relief yet, suppository melting and absorbing
  • 15-30 minutes: onset of action begins
  • 30-60 minutes: significant relief in responders
  • 1-2 hours: peak effect
  • 2-4 hours: sustained analgesia
  • 4-6 hours: duration typically wanes
  • Beyond 6 hours: another dose may be needed if within daily limit
Dr Ada Jex Cori at courierpharmacy.co.uk thinking and looking into the distance

How to use diclofenac suppositories

Correct technique matters for effectiveness. So take a few minutes to understand the technique before you need to use one during severe pain.

Standard dosing

  • Typically one 100mg suppository once daily (often at bedtime)
  • Maximum 150mg total diclofenac daily (across all routes)
  • If using oral diclofenac during the day plus suppository at night, don't exceed 150mg total
  • Duration: as short as possible while providing benefit
  • Follow prescriber's specific instructions for your situation

Standard insertion technique

  1. Wash your hands thoroughly
  2. If possible, use the toilet first — you'll want to avoid immediate defaecation
  3. Remove the suppository from its foil wrapper
  4. Lie on your side with your lower leg straight and upper leg bent forward
  5. Or you can stand with one foot raised on a chair
  6. Or squat
  7. Gently insert the suppository (pointed end first) into the rectum
  8. Push it in gently but firmly, about 2-3cm (roughly the depth of your index finger)
  9. Squeeze buttocks together for a few seconds after insertion
  10. Lie still for 15-20 minutes if possible
  11. Wash your hands again

Practical tips

  • If the suppository is too soft to handle, chill it briefly in the fridge (10-15 minutes)
  • A water-based lubricant can make insertion easier if needed
  • Vaseline or oil-based products can affect the suppository — avoid these
  • Best inserted before bedtime for overnight action
  • Try to avoid defaecation for at least 1 hour after insertion (for full absorption)

If the suppository comes out

  • If it comes out within 15 minutes of insertion — reinsert or use a new one if damaged
  • If it comes out after 30 minutes — significant absorption has occurred, don't replace
  • If it comes out with defaecation shortly after insertion — insert another
  • Always follow prescriber's specific instructions if uncertain

What to combine with

Paired analgesia often works better:

  • Paracetamol 1g every 6 hours (up to 4g daily) — often complementary
  • Weak opioid (codeine) can be added if pain remains severe
  • Antiemetic (metoclopramide, domperidone) if nausea prominent
  • Non-drug measures (rest, positioning, ice, heat as appropriate)

What to avoid combining with

  • Other NSAIDs (ibuprofen, naproxen, etoricoxib, oral diclofenac — beyond the 150mg total daily limit)
  • Aspirin (at analgesic doses)
  • Alcohol (increases GI bleeding risk)
  • Warfarin (unless prescribed together with close monitoring)
  • Grapefruit juice (may affect metabolism)

Storage

  • Store below 25°C
  • Keep in original packaging
  • Don't refrigerate routinely (only briefly if suppositories are too soft to handle)
  • Keep out of sight and reach of children
  • Use by the expiry date on the packaging
Courierpharmacy.co.uk divider Dr Ada Jex Cori

Warnings and precautions

NSAIDs have important safety considerations. So the warnings section is longer and more important than for many other treatments.

Don't use diclofenac if you

  • Have active peptic ulcer, gastric or duodenal ulcer
  • Have had two or more episodes of GI bleeding, ulceration, or perforation
  • Have any history of NSAID-induced GI bleeding or perforation
  • Have coronary heart disease, angina, or previous heart attack
  • Have heart failure (moderate to severe — NYHA class II-IV)
  • Have previous stroke or TIA
  • Have peripheral arterial disease
  • Have uncontrolled hypertension
  • Have severe renal impairment (creatinine clearance <30ml/min)
  • Have severe hepatic impairment
  • Have known aspirin/NSAID-induced asthma or urticaria
  • Are in the third trimester of pregnancy
  • Have known allergy to diclofenac or any excipient
  • Have proctitis or active inflammatory bowel disease affecting rectum
  • Have recent lower GI or rectal surgery
  • Have active haemorrhoids (may worsen)

The cardiovascular assessment

This is essential before use:

  • Prescriber assesses cardiovascular risk factors
  • Age, blood pressure, cholesterol, smoking, diabetes, family history all matter
  • Any history of cardiac events assessed
  • Diclofenac has cardiovascular risk profile similar to COX-2 inhibitors
  • If cardiovascular risk is high, alternative treatment may be needed
  • This isn't optional — it's essential NSAID safety

The gastrointestinal assessment

Also essential:

  • Prescriber asks about previous ulcers, GI bleeding, indigestion
  • Age over 65 increases GI risk
  • Concurrent use of corticosteroids or anticoagulants increases risk
  • Alcohol and smoking increase GI risk
  • Gastroprotection (PPI like omeprazole) may be recommended in higher-risk patients

Use with care if you

  • Are aged 65 or over (higher GI, cardiovascular, and renal risk)
  • Have mild-to-moderate hypertension
  • Have mild-to-moderate renal impairment
  • Have mild-to-moderate hepatic impairment
  • Have a history of dyspepsia or heartburn
  • Are dehydrated
  • Have diabetes
  • Have significant cardiovascular risk factors without established disease
  • Are on anticoagulants or antiplatelets
  • Are on ACE inhibitors, ARBs, or diuretics (renal risk)

The renal function warning

NSAIDs affect kidney function:

  • Prostaglandin inhibition reduces renal blood flow
  • Particularly problematic in dehydration
  • Can cause acute kidney injury
  • Risk higher with ACE inhibitors or diuretics ("triple whammy")
  • Maintain hydration during use
  • Renal function should be checked before and during prolonged use

The bleeding risk warning

NSAIDs affect platelet function:

  • Diclofenac reversibly inhibits platelet function
  • Increased bleeding risk during and shortly after use
  • Higher risk with anticoagulants (warfarin, DOACs)
  • Higher risk with antiplatelets (aspirin, clopidogrel)
  • Increased risk of GI bleeding, surgical bleeding, and bruising

Pregnancy and breastfeeding

  • Third trimester: contraindicated (fetal cardiovascular and renal effects)
  • First and second trimester: use only if benefit clearly outweighs risk
  • Breastfeeding: small amounts excreted; short-course use generally considered acceptable
  • Discuss with prescriber before use in pregnancy or breastfeeding

Use in older adults

Higher risks in older adults:

  • Increased GI risk
  • Increased cardiovascular risk
  • Increased renal risk
  • Increased bleeding risk
  • Often on multiple medications with interactions
  • Consider gastroprotection with PPI
  • Use shortest possible course

Driving and machinery

May affect driving in some cases:

  • Diclofenac can cause dizziness or drowsiness in some patients
  • Severe pain being treated also affects concentration
  • Understand how you respond before driving

When to seek urgent medical help

  • Signs of GI bleeding (black tarry stools, vomiting blood or coffee-ground material)
  • Severe abdominal pain
  • Chest pain or symptoms of heart attack
  • Signs of stroke (facial droop, arm weakness, speech difficulty)
  • Significant swelling, difficulty breathing
  • Severe allergic reaction
  • Signs of severe skin reaction (rash, blistering)
  • Significant reduction in urine output
  • Yellowing of skin or eyes
Dr Ada Jex Cori holding a warning sign courierpharmacy.co.uk

Side effects

NSAIDs have real side effect profiles. Most are mild but some are important safety signals.

Common side effects

  • Local rectal irritation (rectal route specific)
  • Mild abdominal pain
  • Indigestion, heartburn, nausea
  • Diarrhoea or constipation
  • Headache
  • Dizziness
  • Skin rash

Less common side effects

  • Gastric or duodenal ulcer
  • GI bleeding
  • Elevated blood pressure
  • Peripheral oedema (ankle swelling)
  • Elevated liver enzymes
  • Tinnitus
  • Insomnia

Rare side effects

  • Heart attack or stroke (higher risk with prolonged use)
  • Heart failure exacerbation
  • Severe GI bleeding or perforation
  • Acute kidney injury
  • Hepatitis (drug-induced liver injury)
  • Severe skin reactions (Stevens-Johnson syndrome, toxic epidermal necrolysis)
  • Aseptic meningitis
  • Aplastic anaemia

Very rare side effects

  • Severe allergic reactions (anaphylaxis)
  • Bronchospasm in aspirin-sensitive patients
  • Severe hepatic reactions

Stop and seek urgent medical help if

  • Signs of GI bleeding (black stools, vomiting blood)
  • Chest pain, heart attack symptoms
  • Stroke symptoms
  • Severe allergic reaction
  • Severe skin reactions
  • Signs of liver damage (yellowing skin/eyes, dark urine, severe fatigue)
  • Significant reduction in urine output

Yellow Card reporting

If you notice any side effects, please report them through the MHRA Yellow Card scheme at https://yellowcard.mhra.gov.uk/, or talk to our pharmacist.

Courierpharmacy.co.uk divider Dr Ada Jex Cori

Drug interactions

Diclofenac has several important interactions. So mention all medications, herbal remedies, and supplements during consultation.

Avoid combining with

  • Other NSAIDs (ibuprofen, naproxen, etoricoxib, mefenamic acid) — increased side effect risk
  • Aspirin at analgesic doses — increased GI risk (low-dose cardio aspirin discussed separately)
  • Ketorolac (higher NSAID GI risk)

Use with significant caution

  • Warfarin — increased bleeding risk, may need close INR monitoring
  • Direct oral anticoagulants (apixaban, rivaroxaban, edoxaban, dabigatran) — increased bleeding
  • Antiplatelets (clopidogrel, ticagrelor) — increased bleeding
  • Low-dose aspirin for cardioprotection — increased GI risk, gastroprotection recommended
  • SSRIs and SNRIs — increased GI bleeding risk
  • Corticosteroids (oral or systemic) — increased GI risk
  • ACE inhibitors (ramipril, lisinopril, perindopril) — increased renal risk, blood pressure control affected
  • Angiotensin receptor blockers (losartan, candesartan, valsartan) — same as ACE inhibitors
  • Diuretics (furosemide, bendroflumethiazide, spironolactone) — increased renal risk, especially with ACE inhibitors ("triple whammy")
  • Lithium — increased lithium levels, toxicity risk
  • Methotrexate — increased methotrexate toxicity
  • Ciclosporin, tacrolimus — increased renal toxicity
  • Digoxin — increased digoxin levels

Blood pressure medications

NSAIDs can reduce effectiveness:

  • Diclofenac can raise blood pressure
  • Reduces effectiveness of ACE inhibitors, ARBs, beta-blockers, diuretics
  • Blood pressure monitoring during use if you have hypertension

Diabetes medications

  • Diclofenac may affect blood glucose control
  • Monitor blood glucose in diabetes

Alcohol

  • Increases GI bleeding risk significantly
  • Best avoided during NSAID use
  • Also affects hepatic metabolism

Generally safe combinations

  • Paracetamol — often complementary
  • PPIs (omeprazole, lansoprazole, pantoprazole) — often used together as gastroprotection
  • H2 blockers (famotidine)
  • Weak opioids (codeine, dihydrocodeine)
  • Antiemetics (metoclopramide, domperidone, ondansetron)
  • Most antibiotics (though tell prescriber)
Courierpharmacy.co.uk divider Dr Ada Jex Cori

Frequently asked questions

Dr Ada Jex Cori at courierpharmacy.co.uk FAQs

How is this different from diclofenac tablets?

Same active, different route:

  • Both contain diclofenac sodium
  • Suppositories: 100mg via rectum, work with nausea/vomiting
  • Tablets: 25mg or 50mg oral, need swallowing
  • Similar bioavailability and side effect profile
  • Choose suppositories when oral route isn't practical

How fast do they work?

Similar to oral tablets:

  • Onset typically 30 minutes to 1 hour
  • Peak effect at 1-2 hours
  • Duration 4-6 hours per dose
  • Suppositories aren't faster than tablets — the advantage is route, not speed

Can I use them for chronic pain?

Not recommended:

  • Diclofenac at 100mg is intended for short-term acute use
  • Chronic use significantly increases cardiovascular and GI risks
  • Better options exist for chronic pain management
  • Talk to prescriber if you need long-term pain relief

How many can I use per day?

Practical limits:

  • Typically one 100mg suppository once daily (often at bedtime)
  • Maximum 150mg total diclofenac in 24 hours (all routes combined)
  • Don't exceed prescribed dose
  • Duration should be as short as possible

Can I use them alongside oral diclofenac?

Yes, with careful dosing:

  • Total daily diclofenac from all routes must not exceed 150mg
  • Common regimen: 50mg oral morning + 50mg oral lunchtime + 100mg suppository bedtime? — NO, that's 200mg
  • Common regimen: 50mg oral twice daily + no suppository = 100mg total
  • Or 100mg suppository at bedtime + no oral = 100mg total
  • Or one 50mg oral morning + 100mg suppository bedtime = 150mg (maximum)
  • Follow prescriber's specific instructions

Can I combine with paracetamol?

Yes — often recommended:

  • Paracetamol + NSAID gives additive analgesia
  • Different mechanisms mean no additive side effects
  • Paracetamol up to 1g four times daily (4g maximum)
  • Standard approach for effective pain management

Can I combine with codeine?

Yes, if needed for severe pain:

  • Adding weak opioid can help when NSAID alone isn't enough
  • Codeine 30-60mg every 4-6 hours (maximum 240mg daily)
  • Or co-codamol (paracetamol + codeine) instead of paracetamol alone
  • Discuss with prescriber if considering opioid addition

How do I insert them?

Standard technique:

  • Wash hands
  • Lie on your side
  • Insert pointed end first
  • Push in about 2-3cm (finger-depth)
  • Squeeze buttocks briefly
  • Lie still for 15-20 minutes if possible
  • Wash hands after

What if it's too soft to insert?

If too soft to handle:

  • Chill briefly in fridge (10-15 minutes)
  • Don't freeze
  • Store below 25°C to prevent softening
  • Handle quickly once out of packaging

What if it comes out?

Depends on timing:

  • Within 15 minutes: reinsert or use new one if damaged
  • Between 15-30 minutes: probably don't need to replace
  • Beyond 30 minutes: significant absorption occurred, don't replace
  • If unclear: check with pharmacist

Can I use them during my period?

Yes — often useful for severe dysmenorrhoea:

  • Diclofenac is well-established for menstrual pain
  • Suppository route works when period-related nausea affects tablet absorption
  • Start at first sign of pain for best effect
  • Combined with paracetamol works well

Can I use them for renal colic?

Yes — this is one of the strongest indications:

  • NSAIDs are first-line for renal colic pain
  • Effective as opioids for kidney stone pain in most studies
  • Suppository route particularly useful because renal colic often causes vomiting
  • Faster and more reliable than trying to keep tablets down during vomiting

Can I use them for gout attacks?

Yes — commonly used for acute gout:

  • NSAIDs are first-line for acute gout attacks
  • 100mg dose provides strong anti-inflammatory action
  • Suppository route useful when patient can't tolerate tablets
  • Short course (typically 3-5 days) usually sufficient

Can I use them for migraine?

Yes — useful when migraine causes vomiting:

  • Diclofenac has evidence for acute migraine treatment
  • Suppository route valuable when vomiting prevents oral treatment
  • Can be combined with triptan (like zolmitriptan nasal spray) for combined effect
  • Not routinely first-line — triptans usually preferred

What if I'm on blood thinners?

Additional caution needed:

  • Warfarin: increased bleeding risk, INR monitoring recommended
  • DOACs (apixaban, rivaroxaban, etc): increased bleeding risk
  • Antiplatelets (clopidogrel): increased bleeding risk
  • Low-dose aspirin: increased GI risk, gastroprotection recommended
  • Discuss with prescriber before use

Do I need gastroprotection (PPI)?

Depends on risk factors:

  • Age over 65
  • Previous ulcer or GI bleeding history
  • Concurrent low-dose aspirin, corticosteroids, or SSRIs
  • Prolonged NSAID use
  • Multiple risk factors
  • If any apply, PPI (omeprazole, lansoprazole) often recommended
  • Discuss with prescriber

Can I drink alcohol while using them?

Best to avoid:

  • Alcohol significantly increases GI bleeding risk
  • Also affects hepatic metabolism
  • Not directly contraindicated but genuinely risky combination
  • Especially important during acute treatment

Can I use them during pregnancy?

Depends on trimester:

  • Third trimester: contraindicated
  • First and second trimester: only if benefit clearly outweighs risk
  • Paracetamol usually preferred first-line in pregnancy
  • Discuss with prescriber if pregnant or planning pregnancy

How should I store them?

  • Below 25°C
  • In original packaging
  • Away from direct heat and sunlight
  • Only refrigerate briefly if too soft to handle
  • Keep out of reach of children
  • Use by expiry date on packaging

Is my packaging discreet?

  • Plain packaging with no mention of contents
  • Suitable for delivery to home or workplace

How do I order from Courier Pharmacy?

Complete the consultation on courierpharmacy.co.uk. Our prescriber will review your pain condition, cardiovascular status, and GI history, then arrange dispensing if suitable. Your order goes out in plain, discreet packaging with support available throughout your treatment.

More than a prescription: our community

Healthcare shouldn't only happen when you're paying for it.

Every fortnight we run free drop-in talks and clinics at Insomnia, Derby, from 10am to 12pm. So we show up, even when it's free.

Bring a question, bring a friend, bring a stack of bewildering letters from another clinic. We'll sit with you.

We cover pain, migraine, headache, skincare, acne, hair loss, MCAS, weight management, menopause, women's health, men's health, chronic pain, digestive health, allergies, asthma, sleep, and whatever else people bring through the door. No appointment. No cost. No pressure. Just real support and treatment that fits.

This page is for information only and isn't a substitute for personal medical advice. Diclofenac is a licensed prescription-only medicine with important cardiovascular, gastrointestinal, and renal risks. Don't use if you have coronary heart disease, previous MI, uncontrolled hypertension, previous stroke or TIA, active peptic ulcer, previous NSAID-induced GI bleeding, severe renal or hepatic impairment, or several other conditions. Prescriber assessment before use is essential. Intended for short-term acute use, not chronic pain management. Seek urgent medical help for signs of GI bleeding (black tarry stools, vomiting blood), chest pain, stroke symptoms, severe allergic reaction, or severe skin reactions. Signs of severe allergic reaction (facial swelling, breathing difficulty, widespread rash) need immediate medical attention (999).

How this content was created

Written by the Courier Pharmacy editorial team and reviewed by a GPhC-registered prescribing pharmacist.

The content is grounded in the licensed Voltarol 100mg Suppositories Summary of Product Characteristics (Novartis), NICE Clinical Knowledge Summaries on acute pain, gout, renal colic, and dysmenorrhoea, British National Formulary guidance on NSAIDs, MHRA safety updates on NSAID cardiovascular and gastrointestinal risks, decades of published clinical evidence on diclofenac and NSAIDs, and the real experience of patients managing acute pain under prescriber-led care. In addition, it draws on the real questions patients bring to our consultation pathway and drop-in clinics in Derby.

References

[1] Electronic Medicines Compendium (emc) Voltarol 100mg Suppositories — Summary of Product Characteristics. Available at: https://www.medicines.org.uk/emc/product/3776/smpc

[2] National Institute for Health and Care Excellence — Clinical Knowledge Summary on NSAIDs. Available at: https://cks.nice.org.uk/topics/nsaids-prescribing-issues/

[3] British National Formulary (BNF). (n.d.) Diclofenac sodium. Available at: https://bnf.nice.org.uk/drugs/diclofenac-sodium/ (Accessed: 6 July 2026).

Courierpharmacy.co.uk divider Dr Ada Jex Cori

Download patient leaflet

https://www.medicines.org.uk/emc/files/pil.101430.pdf

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Diclofenac 100mg Suppositories
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