Drug, Food and Supplement — Interactions With Sorafenib

Check with your oncology team before taking either. Both ibuprofen and aspirin can increase the risk of bleeding, and sorafenib already has effects on clotting and blood pressure. Paracetamol is generally considered safer for pain relief while on sorafenib, but even that should be discussed with your team because of liver considerations. Do not assume an over-the-counter painkiller is automatically safe — ask first, because the answer is usually quick to get.

Yes, significantly. St. John's Wort (Hypericum perforatum) induces the liver enzymes that process sorafenib, and this can substantially reduce the amount of the drug that remains active in your body. This interaction is well established in sorafenib's prescribing information reviewed by drug regulators. The fact that it is a herbal product does not reduce its potency as an interacting agent. If you are taking it, stop and tell your oncologist at your next appointment — or sooner if you have recently started sorafenib.

Sorafenib is absorbed less well after a high-fat meal. Take it either without food or with only a light, low-fat meal. Taking it at consistent times each day — most people take it twice daily, roughly twelve hours apart — also helps your team interpret your side effects and blood tests reliably. If you are unsure what counts as a light meal in practice, ask your oncology team or a dietitian at your centre.

No — do not stop warfarin on your own. Tell both your cardiologist and your oncologist that you are starting sorafenib, because sorafenib can cause changes in your INR. More frequent INR monitoring is usually needed in the first weeks. Your anticoagulation team may need to adjust your warfarin dose during that period. The two medicines can be used together, but only with careful, regular monitoring — not on an assumption that nothing has changed.

Possibly. Carbamazepine, phenytoin and phenobarbital all significantly reduce sorafenib levels by speeding up the liver enzymes that clear it. If you take one of these, your oncologist and neurologist need to speak before you start sorafenib, because running the two together may mean the cancer treatment is not working at the level intended. Do not stop your epilepsy medicine without neurological advice — stopping abruptly carries its own serious risks.

We do not have enough evidence to say most Ayurvedic or herbal preparations are safe alongside sorafenib, because the relevant interactions have not been formally studied for most of them. What we do know is that several plant-based products — St. John's Wort being the clearest example — affect the same enzyme systems sorafenib relies on, and others may do the same. Tell your oncology team about everything you take and let them advise. Do not stop something you feel is helping without that conversation.

Tell that doctor immediately that you are taking sorafenib before the antibiotic is dispensed. Rifampicin and rifabutin — commonly used for tuberculosis — have a significant interaction and should prompt a direct conversation between your TB team and your oncologist. Neomycin, found in some ear and skin preparations, also interacts. Many other antibiotics are safe alongside sorafenib, but your oncologist should confirm before you start. This is not a reason to delay treating an infection — it is a reason to make one phone call first.

Bring a written list of everything you take: every prescription medicine, every supplement, every vitamin, every Ayurvedic or herbal preparation, and anything bought from a pharmacy or online without a prescription. Include medicines prescribed by a dentist, a GP, or any other specialist, even for an apparently unrelated condition. If you are not sure whether something matters, include it anyway — your team can rule it out in less time than it takes to manage a preventable interaction.