Levothyroxine Actavis Drug Interactions

Please tell the doctor or pharmacist if the patient is taking or has recently taken any other medicines, including medicines obtained without a prescription. Especially: medicines to treat diabetes (e.g. insulin, metformin); medicines to control the heart rate such as digoxin; tricyclic antidepressants (e.g. amitriptyline, dosulepin); medicines that stimulate the sympathetic nervous system such as adrenaline (epinephrine); anticoagulants (used to thin the blood) such as warfarin, dicoumarol, acenocoumarol, phenindione; sodium polystyrene sulphonate (used to treat kidney disease); colesytramine (used to treat diarrhoea); medicines to treat stomach ulcers such as sucralfate, cimetidine; aluminium hydroxide (used to treat heartburn); medicines containing calcium carbonate; "iron" tablets (containing ferrous sulphate); medicines to treat epilepsy such as carbamazepine, phenytoin, phenobarbital, primidone; rifampicin (used to treat serious infections); aspirin and phenylbutazone (medicines to reduce inflammation); propranolol (a beta-blocker); medicines containing oestrogen (e.g. HRT, oral contraceptives - "the pill"); amiodarone (used to treat some heart conditions); ketamine (an anaesthetic); lovastatin or colesevelam (used to reduce cholesterol); orlistat (used to aid weight loss); corticosteroids (e.g. hydrocortisone, prednisolone); medicines containing testosterone and mesterolone.
Post-marketing cases have been reported indicating a potential interaction between ritonavir containing products and levothyroxine. Thyroid-stimulating hormone (TSH) should be monitored in patients treated with levothyroxine at least the first month after starting and/or ending ritonavir treatment.