Drug interactions
Carbamazepine + Norethindrone transdermal
Severity: Major
Carbamazepine and Norethindrone transdermal: major interaction.
Last updated Sources: US FDA label
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
Carbamazepine is a potent enzyme inducer and lowers circulating progestin concentrations. This can lead to contraceptive failure and breakthrough bleeding or other menstrual irregularities.
What this interaction means in plain words
Carbamazepine and Norethindrone transdermal 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
Carbamazepine induces CYP3A4 and increases hepatic clearance of norethindrone.
What to do
Use a non-hormonal or enzyme-inducer-independent contraceptive such as a copper IUD or levonorgestrel IUD or DMPA. If a hormonal method is kept, add a barrier method and continue it for several weeks after carbamazepine is stopped.
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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References
Other interactions of Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Norethindrone transdermal?
MediHelp rates the interaction as major. Carbamazepine and Norethindrone transdermal 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. Carbamazepine is a potent enzyme inducer and lowers circulating progestin concentrations. This can lead to contraceptive failure and breakthrough bleeding or other menstrual irregularities.
How serious is the interaction between Carbamazepine and Norethindrone transdermal?
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 non-hormonal or enzyme-inducer-independent contraceptive such as a copper IUD or levonorgestrel IUD or DMPA. If a hormonal method is kept, add a barrier method and continue it for several weeks after carbamazepine is stopped.
What other medicines interact with Carbamazepine?
MediHelp also lists interactions of Carbamazepine with, for example, Artemether / lumefantrine, Cabotegravir, Delamanid. The full list is on the Carbamazepine page.
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