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Drugs affecting thyroxine (levothyroxine) dosage

Authoring team

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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