Mifepristone and Mitotane interaction
Mifepristone and Mitotane: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Mifepristone label · effective 2025-09-25
CYP3A inducers: Do not use mifepristone with CYP3A inducers ( 7.3 ).
Avoid co-administration of mifepristone and CYP3A inducers such as rifampin, rifabutin, rifapentin, phenobarbital, phenytoin, carbamazepine, and St.
The dose of mifepristone should be limited to 900 mg, and strong inhibitors of CYP3A should be used only when necessary. [See Dosage and Administration ( 2.4 ), Warnings & Precautions ( 5.6 ), and Clinical Pharmacology ( 12.3 )] 7.3 CYP3A Inducers No medications that induce CYP3A have been studied when co-administered with mifepristone.
From the Mitotane (Lysodren) label · effective 2026-03-03
Hormonal contraceptives: Avoid concomitant use with LYSODREN.
Hormonal Contraceptives Avoid concomitant use of LYSODREN with hormonal contraceptives [see Warnings and Precautions (5.8) , Use in Specific Populations (8.3) ].
Advise females of reproductive potential to use effective nonhormonal contraception, during treatment with LYSODREN and after discontinuation of treatment for as long as mitotane plasma levels are detectable, since LYSODREN can render some hormonal contraceptives ineffective [see Drug Interactions (7.2) , Use in Specific Populations (8.1 , 8.3) ].
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.