Drug interactions
Medroxyprogesterone + Pentobarbital
Severity: Major
Medroxyprogesterone and Pentobarbital: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Barbiturates are enzyme inducers that accelerate steroid hormone metabolism and can lower medroxyprogesterone exposure. This may cause contraceptive failure or reduced therapeutic effect.
What this interaction means in plain words
Medroxyprogesterone and Pentobarbital can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Barbiturate induction of CYP3A4 and other hepatic enzymes increases progestin clearance.
What to do
Use a contraceptive method not affected by enzyme induction, such as an IUD, or add barrier protection. Monitor for breakthrough bleeding and loss of effect.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Medroxyprogesterone
Frequently asked questions
Can I take Medroxyprogesterone with Pentobarbital?
MediHelp rates the interaction as major. Medroxyprogesterone and Pentobarbital can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Barbiturates are enzyme inducers that accelerate steroid hormone metabolism and can lower medroxyprogesterone exposure. This may cause contraceptive failure or reduced therapeutic effect.
How serious is the interaction between Medroxyprogesterone and Pentobarbital?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use a contraceptive method not affected by enzyme induction, such as an IUD, or add barrier protection. Monitor for breakthrough bleeding and loss of effect.
What other medicines interact with Medroxyprogesterone?
MediHelp also lists interactions of Medroxyprogesterone with, for example, Bosentan, Brigatinib, Eslicarbazepine. The full list is on the Medroxyprogesterone page.
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