Clopidogrel
In brief
- Clopidogrel is a prescription-only medicine (POM) in the UK and must be obtained with a valid prescription; do not take it without medical supervision.
- Clopidogrel is used to prevent atherothrombotic events (acute coronary syndromes, after percutaneous coronary intervention/stenting, secondary prevention of stroke, myocardial infarction and peripheral arterial disease). It is an antiplatelet agent that irreversibly blocks the P2Y12 ADP receptor on platelets, reducing platelet aggregation.
- Usual dosage: a maintenance dose of 75 mg once daily; for acute coronary syndromes/PCI a loading dose of 300–600 mg once is used to achieve more rapid platelet inhibition.
- Form of administration: oral film-coated tablets (commonly 75 mg and 300 mg).
- Onset time: significant antiplatelet effect can begin within about 2 hours after a loading dose, with variable response between individuals; full steady‑state inhibition with daily dosing develops over several days.
- Duration of action: clopidogrel produces irreversible inhibition of affected platelets, so the effect persists for the lifespan of the platelets (approximately 7–10 days) after stopping; daily dosing maintains continuous effect.
- Alcohol warning: avoid excessive alcohol while taking clopidogrel as alcohol can increase bleeding risk and gastric irritation; discuss alcohol use with your prescriber.
- The most common side effect is easy bruising and minor bleeding (nosebleeds, gum bleeding); other common effects include diarrhoea, abdominal pain and dyspepsia.
- Would you like to try clopidogrel without a prescription?
Legal status in the UK
Clopidogrel is a prescription-only medicine (POM) in the UK.
In our online pharmacy, clopidogrel is available without a prescription, with discreet delivery to the United Kingdom in 9–21 days.
Basic clopidogrel information
- INN (international nonproprietary name): Clopidogrel
- Brand names available in the United Kingdom: Plavix; generic clopidogrel tablets
- ATC code: B01AC04
- Forms and dosages: Tablets 75 mg (maintenance) and 300 mg (loading)
- Manufacturers in the United Kingdom: Sanofi (Plavix); generic suppliers
- Registration status in the United Kingdom: Prescription-only medicine (POM)
- OTC / Rx classification: Prescription-only medicine (POM)
Who clopidogrel is for
Clopidogrel is prescribed after heart attack, coronary stent insertion and for prevention following ischaemic stroke or peripheral arterial disease.
There are fast-acting loading doses (300–600 mg) used in acute coronary syndromes to provide platelet inhibition within hours.
Quick tips for newly discharged patients
- Take the prescribed loading dose as instructed in hospital or by your cardiology team.
- Continue 75 mg once daily maintenance unless advised otherwise by your clinician.
- Tell every healthcare professional you are taking clopidogrel before procedures.
- Ask your pharmacist if you are unsure about interactions with other medicines.
Brands and strengths
Clopidogrel is available as branded Plavix and as generic clopidogrel tablets.
The predominant tablet strengths are 75 mg for maintenance and 300 mg for loading doses where indicated.
Indications, typical regimens and duration
When and how clopidogrel is prescribed
What is this medicine for?
- Acute coronary syndromes (ACS) and percutaneous coronary intervention (PCI)
- Regimen: 300–600 mg loading dose once, then 75 mg once daily maintenance.
- Duration: At least 12 months following ACS/PCI, adjusted by stent type and individual risk.
- Secondary prevention after myocardial infarction
- Regimen: 75 mg once daily maintenance.
- Duration: Often indefinite or per clinician review.
- Ischaemic stroke and peripheral arterial disease (PAD)
- Regimen: 75 mg once daily maintenance without routine loading dose.
- Duration: Often long-term unless adverse effects or clinician decision.
Quick dosing table
| Indication | Loading dose | Maintenance dose |
|---|---|---|
| ACS / PCI | 300–600 mg once | 75 mg once daily |
| Stroke / MI / PAD prevention | No routine loading | 75 mg once daily |
How clopidogrel works
Action, onset and clinical relevance
Clopidogrel is a P2Y12 receptor inhibitor that reduces platelet aggregation and thrombus formation.
It is a prodrug that requires hepatic biotransformation to an active metabolite which then blocks the platelet ADP receptor.
Because activation depends on liver enzymes there is variable response between patients.
A loading dose achieves measurable antiplatelet effect within hours, whereas maintenance dosing alone takes longer to reach full effect.
That delayed onset without a loading dose explains why prescribers may use ticagrelor or prasugrel in certain high-risk PCI scenarios where rapid and stronger inhibition is needed.
Pathway in brief
- Prodrug (Clopidogrel) → Liver activation → Active metabolite → P2Y12 receptor inhibition on platelets.
- Prodrug
- A medicine given in inactive form that requires metabolism to become active.
- Active metabolite
- The converted compound that produces the antiplatelet effect.
- P2Y12 receptor
- A platelet ADP receptor targeted to reduce aggregation and prevent clots.
Contraindications and cautions
Absolute and relative contraindications
- Absolute contraindications: active pathological bleeding such as peptic ulcer or intracranial haemorrhage.
- Absolute contraindications: known hypersensitivity to clopidogrel or any excipient.
- Relative cautions: bleeding disorders, recent major surgery or trauma.
- Relative cautions: severe liver impairment and patients on concurrent anticoagulant therapy due to increased bleeding risk.
- Relative cautions: renal impairment—use with caution and monitor for bleeding complications.
Side effects, prevalence and patient counselling
Common, less common and serious adverse effects
Patients most often notice bruising and minor bleeding such as nosebleeds or bleeding gums.
Gastrointestinal upset including diarrhoea, abdominal pain and dyspepsia are common and usually mild.
Less common symptoms include rash, itching, headache and dizziness.
Rare but serious events include major gastrointestinal or intracranial haemorrhage, neutropenia and thrombotic thrombocytopenic purpura.
Advise patients to seek urgent care for significant bleeding, sudden severe headache or new neurological symptoms.
Symptom action plan
- If you have prolonged bleeding that does not stop with pressure, go to A&E or call NHS 111.
- If you see black/tarry stools or vomit blood, seek emergency care immediately.
- If you develop unexplained bruising or petechiae, contact your clinician for assessment.
- Common symptoms
- Bruising, minor bleeding, diarrhoea, abdominal discomfort — usually monitor and advise symptomatic care.
- Serious symptoms
- Major bleeding, sudden severe headache, neurological deficit — immediate emergency assessment required.
Drug interactions
High-risk interactions and counselling points
Tell your prescriber or pharmacist about all other medicines you take.
| Interacting drug class | Effect | Action |
|---|---|---|
| Oral anticoagulants | Markedly increased bleeding risk | Refer to prescriber for risk/benefit review; ensure frequent monitoring and clear instructions. |
| NSAIDs (e.g., ibuprofen) | Increased gastrointestinal bleeding | Advise caution; suggest paracetamol for analgesia where appropriate and consult prescriber for chronic NSAID use. |
| SSRIs / SNRIs | Elevated bleeding risk (platelet function affected) | Discuss with prescriber if combined; monitor for bleeding signs. |
| Strong CYP2C19 inhibitors (e.g. some PPIs) | May reduce clopidogrel activation and effectiveness | Avoid where possible; omeprazole interaction may be clinically variable—review therapy and consider alternatives. |
Medicines to mention to your prescriber or pharmacist
- Anticoagulants such as warfarin or DOACs.
- Regular NSAID use or recent prescription for naproxen or ibuprofen.
- Antidepressants like SSRIs or SNRIs.
- Any prescribed proton pump inhibitor, especially omeprazole.
Switching, generics and alternatives
When to choose clopidogrel vs ticagrelor/prasugrel and generics
Clopidogrel is commonly used for long-term maintenance and has generic options available.
In high-risk ACS/PCI cases, prescribers may use ticagrelor or prasugrel for stronger and faster platelet inhibition.
Licensed generic clopidogrel products are equivalent to the branded product.
| Agent | Efficacy | Bleeding risk |
|---|---|---|
| Clopidogrel | Effective for maintenance therapy | Moderate |
| Ticagrelor | Higher platelet inhibition in ACS | Higher |
| Prasugrel | Higher platelet inhibition in selected PCI patients | Higher |
Patients should keep taking 75 mg once daily for maintenance unless the prescriber advises otherwise.
Dosage administration, missed dose and overdose actions
Practical dosing tips and emergency guidance
Usual maintenance dosing is 75 mg once daily taken at the same time each day.
Loading doses of 300–600 mg are used in ACS or during PCI as directed by hospital teams.
If a dose is missed, take it as soon as remembered unless it is nearly time for the next dose, in which case skip the missed dose.
Do not double up doses to make up for a missed tablet.
There is no specific antidote for clopidogrel overdose and the main risk is prolonged bleeding.
Seek immediate medical attention for overdose and bleeding, and supportive measures such as platelet transfusion may be considered in severe cases.
Stepwise missed-dose actions
- Missed this morning and remembered within a few hours: take the missed 75 mg dose.
- Remembered close to next dose: skip the missed dose and continue regular schedule.
- Uncertain or multiple missed doses: contact prescriber or pharmacist for advice.
Emergency signs requiring urgent care
- Persistent bleeding that will not stop.
- Very heavy menstruation or nosebleeds unresponsive to simple measures.
- Black stools, vomiting blood, sudden severe headache or focal neurological symptoms.
Monitoring and laboratory considerations
What to monitor and when to refer
Routine platelet function testing is not standard in primary care but may be used in specialist settings for selected patients.
Advise patients to report any new or worsening bleeding or persistent gastrointestinal symptoms to their prescriber.
Consider referral for liver function review in those with severe hepatic impairment as clopidogrel activation is hepatic.
Patients with severe renal disease should be monitored closely for bleeding complications.
Monitoring triggers
- New or unexplained bleeding or bruising.
- Persistent GI symptoms such as abdominal pain or black stools.
- Planned surgery or dental procedures—liaise with prescriber for perioperative management.
- Primary care follow-up
- Routine checks for adherence, side effects and concurrent medicines.
- Secondary care follow-up
- Specialist platelet function testing, reassessment after stent placement or complex bleeding problems.
Key points for patients
Maintenance dosing is 75 mg once daily; take a missed dose as directed and never double up.
Common side effects are bruising and gastrointestinal upset; seek help promptly for serious bleeding signs.
Discuss NSAIDs and anticoagulants with the prescriber before taking them.
Carry information about your antiplatelet therapy, especially when travelling or attending other healthcare appointments.
Storage
Store clopidogrel tablets at room temperature between 15–30°C away from moisture and light.
Keep the tablets in the original blister pack or bottle to reduce moisture exposure and preserve stability.
Frequently asked questions
Common patient questions
| Question | Short answer | When to seek medical advice |
|---|---|---|
| Can I stop clopidogrel suddenly? | No — speak to your prescriber before stopping. | If you consider stopping because of bleeding or side effects, seek clinician review urgently. |
| Can I take ibuprofen? | Caution — NSAIDs increase gastrointestinal bleeding risk; use paracetamol where possible. | If you have chronic pain needing NSAIDs, discuss with the prescriber first. |
| Is clopidogrel safe in pregnancy? | Discuss with your clinician as individual risk/benefit must be reviewed. | If you become pregnant while taking clopidogrel, contact your obstetric team promptly. |
| How soon after PCI should I take it? | Follow loading guidance from the hospital team; a 300–600 mg loading dose is typical in ACS/PCI. | If you did not receive clear instructions at discharge, contact the cardiology team or pharmacist. |
- For further patient-facing information, consult NHS patient leaflets and official product summaries.
Delivery across the United Kingdom
| City | Region | Delivery time |
|---|---|---|
| London | England | 9–21 days |
| Birmingham | England | 9–21 days |
| Manchester | England | 9–21 days |
| Glasgow | Scotland | 9–21 days |
| Leeds | England | 9–21 days |
| Liverpool | England | 9–21 days |
| Bristol | England | 9–21 days |
| Sheffield | England | 9–21 days |
| Edinburgh | Scotland | 9–21 days |
| Belfast | Northern Ireland | 9–21 days |
| Cardiff | Wales | 9–21 days |
| Newcastle Upon Tyne | England | 9–21 days |
| Nottingham | England | 9–21 days |
| Leicester | England | 9–21 days |
| Plymouth | England | 9–21 days |
