Levothyroxine Sodium: Non-reproductive hormone. Vast clinical experience of non-porphyrinogenicity. Liothyronine Sodium: Non-reproductive hormone.

Levothyroxine Sodium: Synthetic thyroid hormone used for substitution in hypothyroidism. C.Andersson; patient reports: tolerated (n=21). Liothyronine Sodium: Synthetic thyroid hormone used where rapid thyroid hormone metabolism is desired, e.g. in scintigraphy.

Levothyroxine Sodium: Uneventful use reported in 79 patients. Liothyronine Sodium: Uneventful use reported in 1 patient with acute porphyria.