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Ticagrelor inhibits the blood platelets and is used together with low-dose aspirin after an acute coronary syndrome, usually for twelve months. Unlike clopidogrel, it acts directly, quickly and reversibly — which is why it has to be taken twice a day, and every missed dose counts. A typical side effect is a feeling of breathlessness that is often harmless but should still be assessed by a doctor.
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According to the SmPC, stopping antiplatelet therapy early can increase the risk of cardiovascular death, heart attack and stroke.¹ Because ticagrelor acts reversibly, the protection has largely disappeared after a few days. That makes it easy to plan around — but also sensitive to spontaneous breaks.
If there should be no platelet inhibition during a planned operation, ticagrelor is stopped five days beforehand according to the SmPC.¹ Whether this is necessary is decided jointly by the surgeon and the cardiology practice — not in the waiting room. In the first year after a stent, procedures that can wait are often postponed. How to prepare for this discussion is explained in the guide medications before surgery.
Dental cleaning, fillings and often simple tooth extractions are usually possible without stopping; the practice then uses local measures to stop bleeding. For colonoscopies with polyp removal or other procedures with a higher risk of bleeding, the approach is planned individually. At every appointment, actively say that you take ticagrelor and aspirin — the SmPC explicitly asks you to inform your doctor and dentist before any operation.¹
An important point for emergency teams: according to the SmPC, platelet transfusions hardly reverse the effect of ticagrelor as long as the active ingredient is still in the blood.¹ That is why ticagrelor belongs in your emergency and medication plan, clearly visible. Everyday tips for living with a tendency to bleed can be found in the guide living with blood thinners.
Ticagrelor is broken down mainly by the liver enzyme CYP3A4 and pumped out of cells by the transport protein P-glycoprotein. It weakly inhibits CYP3A4 itself and raises the levels of some other medicines. On top of this come all medicines that increase the tendency to bleed.¹
| Combination | Consequence | What to do |
|---|---|---|
| Strong CYP3A4 inhibitors: clarithromycin, ketoconazole, ritonavir, atazanavir, nefazodone | Ticagrelor levels rise sharply, risk of bleeding | Contraindicated — always mention ticagrelor when an antibiotic is prescribed |
| Strong enzyme inducers: rifampicin, carbamazepine, phenytoin, phenobarbital | Ticagrelor levels fall markedly, protection may be insufficient | Do not combine, according to the SmPC |
| Anti-inflammatory painkillers such as ibuprofen, diclofenac, naproxen | More stomach and bowel bleeding | Avoid if possible; discuss alternatives |
| Anticoagulants such as apixaban, rivaroxaban, phenprocoumon, heparins | Markedly higher risk of bleeding | Only as planned by a doctor; when an anticoagulant is also needed, guidelines usually prefer clopidogrel |
| SSRI antidepressants such as sertraline, citalopram, paroxetine | Increased tendency to bleed | Caution according to the SmPC; watch for signs of bleeding |
| High-dose aspirin (more than 300 mg daily) | In the licensing trial, ticagrelor worked less well with high aspirin doses | Not recommended according to the SmPC; do not take additional aspirin painkillers without checking first |
| Simvastatin or lovastatin above 40 mg | Statin levels rise, more muscle side effects | Not recommended; according to the SmPC, atorvastatin is hardly affected |
| Rosuvastatin | Levels about 2.4 times higher, risk of muscle damage | Weigh up benefits and risks; report muscle pain |
| Digoxin | Digoxin levels rise | Check levels and pulse |
| Pulse-slowing medicines: beta blockers, verapamil, diltiazem | Slower pulse possible; diltiazem and verapamil can also raise ticagrelor levels | With caution; report dizziness or fainting |
| Morphine and other opioids (especially in the acute phase) | Absorption of ticagrelor delayed and reduced | Mainly relevant in hospital; inform the practice |
| Grapefruit juice in large amounts | About double the ticagrelor level | Usually not clinically relevant according to the SmPC; still avoid large amounts |
The most commonly underestimated medicines in everyday life are over-the-counter painkillers. A pack of ibuprofen for back pain or an effervescent aspirin tablet for a headache noticeably increase the risk of stomach bleeding on ticagrelor plus aspirin. Paracetamol or metamizole are often the better choice, but these should also be briefly discussed; background in painkillers compared. Many people on dual antiplatelet therapy are also given a stomach protector such as pantoprazole — unlike with clopidogrel, no interaction with stomach protectors is known for ticagrelor.
The SmPC does not list a specific interaction with alcohol. However, larger amounts irritate the stomach lining and thus increase the risk of bleeding; after a heart attack, restraint makes sense anyway. More on this under medications and alcohol. With every new prescription — including antibiotics, antifungals or HIV medicines — it is worth taking a look at the interaction check.
Ticagrelor is not “better” or “worse” than the other antiplatelet medicines, but intended for a particular situation: the year after an acute coronary syndrome. Detailed profiles of the two neighbouring active ingredients can be found under clopidogrel and aspirin.
| Active ingredient | Mode of action | Dosing | Typical role and notable feature |
|---|---|---|---|
| Aspirin (low-dose) | Inhibits the enzyme COX-1 in the platelets, permanently | Once a day | Basis of almost every antiplatelet therapy in coronary heart disease, usually for life |
| Clopidogrel | Precursor, activated in the liver; blocks P2Y12 permanently | Once a day | In stable coronary heart disease, after a stent with a high bleeding risk, in combination with anticoagulants; effect varies between individuals; no breathlessness effect |
| Ticagrelor | Acts directly, blocks P2Y12 reversibly | Twice a day | After acute coronary syndrome; stronger and faster than clopidogrel, but more bleeding and often a feeling of breathlessness |
| Prasugrel | Precursor, activated more reliably than clopidogrel; blocks P2Y12 permanently | Once a day | After acute coronary syndrome treated with a catheter procedure; not after stroke or TIA; used cautiously in older people and those with low body weight |
To put it honestly: the 2023 European guideline names prasugrel as the preferred option over ticagrelor in acute coronary syndrome treated with a stent, unless there are reasons against it; ticagrelor remains an equally established alternative, for example if it was already started before the cardiac catheter examination.³ Which antiplatelet medicine suits you depends on your bleeding risk, age, weight, previous strokes, other medicines and tolerability. A switch — for example because of persistent breathlessness or bleeding — is possible and is planned by the practice without a gap in protection.
No, this is one of the best-known side effects of ticagrelor and occurs in about one in seven people. Typical is air hunger at rest, often in the first few days to weeks, without your ability to cope with exertion getting worse. In many people it eases off. It should still be assessed by a doctor, because after a heart attack the heart itself can also be the cause. Note down when it occurs and whether you manage stairs less well than before. If it does not improve and bothers you in everyday life, switching to a different antiplatelet medicine is a real option.
No. According to the SmPC, you simply take the next tablet at the usual time, without making up the missed one or doubling the dose. A single missed dose is usually no reason to panic. But if it happens more often, the protection drops again and again — and with a recent stent, that is a real risk. A fixed evening reminder or linking the dose to brushing your teeth helps many people.
Probably not — it is the expected price of platelet inhibition, especially as you take two active ingredients at once. Minor bleeding is annoying, but usually harmless. Still raise it, especially if nosebleeds are frequent or long-lasting, your periods become noticeably heavier or you feel increasingly drained — then you will be checked for anaemia. Black stools or blood in the urine, on the other hand, are not a mere nuisance but need to be checked immediately.
That is decided by the cardiology practice, not by the date alone. Ticagrelor often ends after twelve months and aspirin continues on its own. With a high risk, ticagrelor can be continued at the lower strength of 60 mg twice a day; with a high bleeding risk, the treatment may already have been reduced earlier. Call in good time before the deadline or raise it at your check-up — and do not simply stop because the last pack is empty.
The interaction check reviews your whole list, including over-the-counter painkillers.
