Drugs affecting thyroxine (levothyroxine) dosage
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:
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