What it is used for
- Helping prevent strokes and 'mini-strokes' (TIAs), often combined with low-dose aspirin
- Reducing clot risk in some people, including after certain heart-valve surgery
- Sometimes used in a heart-imaging test under supervision
How it works
Dipyridamole reduces the tendency of platelets to clump and also helps widen blood vessels. Together these effects lower the chance of clots forming, particularly in the small vessels of the brain.
How it is taken
Usually supplied as oral tablets or modified-release capsules, sometimes combined with aspirin in one product. It is generally taken one to a few times a day; modified-release forms are swallowed whole. Take it exactly as your doctor or pharmacist directs and as written on the label.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Headache (common when first starting, often eases)
- Dizziness
- Flushing
- Tummy upset, nausea or diarrhoea
- Muscle aches
Serious effects — get help
- Heavy or unusual bleeding, black/tarry stools, blood in urine - seek urgent care
- Chest pain or worsening angina
- Fast or irregular heartbeat
- Serious allergic reaction: facial or throat swelling, trouble breathing, severe rash
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Other blood thinners and antiplatelets (raises bleeding risk)
- Anti-inflammatory painkillers (NSAIDs)
- Adenosine (used in some heart tests)
- Certain blood-pressure medicines (may add to blood-pressure lowering)
- Some medicines for myasthenia gravis
Who should take care
- Tell your clinician about angina, recent heart attack or low blood pressure
- Headaches at the start are common - ask your pharmacist how to manage them rather than stopping
- Report any bleeding problems
- Tell any doctor, dentist or surgeon you take it before procedures
- Discuss pregnancy or breastfeeding with your clinician