Medicines to treat epilepsy (e.g. phenytoin, carbamazepine)
Antibiotic medicines to treat an infection (e.g. tetracyclines, rifampicin, co-trimoxazole)
Antiviral medicines to treat HIV (e.g. ritonavir, nelfinavir)
Anticancer medicines
Herbal preparations containing St John's Wort (Hypericum perforatum)
Aminoglutethimide, sometimes used in Cushing's syndrome
Ciclosporin (for suppressing the immune system)
Non-steroidal inflammatory drugs (NSAIDs) for treating pain and inflammation
Medicines for high blood pressure
Rifamycin
Warfarin
Sex hormones (e.g. HRT treatments)
A statin for high cholesterol
griseofulvin