drugs affecting thyroxine (levothyroxine) dosage
Last reviewed 01/2018
Drugs which prevent absorption of levothyroxine include:
- calcium salts
- ferrous sulphate
- aluminium hydroxide
- cholestyramine
Drugs which increase clearance of levothyroxine include:
- phenytoin
- carbamazepine
- phenobarbitone
- rifampicin (1)
Reference: