Demadex with the birth control pill
Many women of reproductive age take a combined or progestogen-only oral contraceptive while also using a chronic medication such as Demadex (Torsemide). The combination is generally fine at 5mg, 10mg, 20mg, 100mg, but a small number of medications can reduce contraceptive efficacy meaningfully and need either a backup method or a switch.
How Demadex can affect contraceptive efficacy
Combined and progestogen-only contraceptives are metabolised through CYP3A4. Strong CYP3A4 inducers (some antiepileptics, rifampicin, St John's Wort) lower contraceptive plasma levels and reduce efficacy. Whether Torsemide acts on CYP3A4 determines whether Demadex affects contraception. Most agents in Diuretics have no clinically meaningful effect on the pill at 5mg, 10mg, 20mg, 100mg.
Practical guidance
According to the prescribing information for Torsemide, women on hormonal contraception should review Demadex with the prescribing pharmacist or doctor. Where an interaction is documented, additional barrier contraception or switching to a non-oral method (IUD, implant) for the duration of Demadex therapy is the standard mitigation.
Frequently asked questions
Will Demadex make my pill less effective? ▾
Most Diuretics medications at 5mg, 10mg, 20mg, 100mg do not affect oral contraceptive efficacy. The exceptions are CYP3A4-inducing drugs and a small number of others. The prescribing information for Torsemide states whether the interaction is meaningful.
Do I need a backup contraceptive on Demadex? ▾
Backup contraception is needed only when there is a documented interaction between Demadex and the contraceptive method. For most users at 5mg, 10mg, 20mg, 100mg, no backup is required. The pharmacist confirms whether Torsemide interacts with hormonal contraception.
More on Demadex
- With alcoholDemadex and alcohol — is it safe to drink?
- With foodShould Demadex be taken with food?
- Side effectsDemadex side effects: common, rare and warning signs
- Dosage guideDemadex dosage guide: how much to take and when
- OnsetHow fast does Demadex start working?
- DurationHow long does Demadex last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.