Don ’ t take these medicines with Telzir: • other medicines containing amprenavir (used to treat HIV) • astemizole or terfenadine (commonly used to treat allergy symptoms – these medicines may be available without prescription) • pimozide (used to treat schizophrenia) • cisapride (used to relieve indigestion) • ergot derivatives (used to treat headaches) • rifampicin (used to treat tuberculosis) • amiodarone, quinidine, flecainide and propafenone (heart medicines) • bepridil (used to treat high blood pressure) • products containing St John’ s wort (Hypericum perforatum). • These medicines are not recommended with Telzir/ ritonavir: