Enzyme inducers such as barbiturates, phenylbutazone, phenytoin, ampicillin or tetracyclines are expected to reduce plasma concentrations of<unk> , but no systematic research has been done.
Medrogestone
Oxogestone
Phospho soda
Hermaphrodite 
Anagestone acetate
Medi-Cal
Diatrizoate
Lithotrite