Statin + grapefruit juice
bad
metronidazole + alcohol
bad
warfarin + cranberry
bad
warfarin + amiodarone
amiodarone potentiates anticoagulant effect
statin + clarithromycin
bad
calcium + thyroxine
decreased absorption from gut
warfarin + NSAID
bleed (but not with low dose aspirin)
ACEI + spironolactone
hyperkalaemia