Effexor 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 Effexor (Venlafaxine). The combination is generally fine at 37.5mg, 75mg, 150mg, but a small number of medications can reduce contraceptive efficacy meaningfully and need either a backup method or a switch.
How Effexor 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 Venlafaxine acts on CYP3A4 determines whether Effexor affects contraception. Most agents in Anti-Depressants have no clinically meaningful effect on the pill at 37.5mg, 75mg, 150mg.
Practical guidance
According to the prescribing information for Venlafaxine, women on hormonal contraception should review Effexor 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 Effexor therapy is the standard mitigation.
Frequently asked questions
Will Effexor make my pill less effective? ▾
Most Anti-Depressants medications at 37.5mg, 75mg, 150mg do not affect oral contraceptive efficacy. The exceptions are CYP3A4-inducing drugs and a small number of others. The prescribing information for Venlafaxine states whether the interaction is meaningful.
Do I need a backup contraceptive on Effexor? ▾
Backup contraception is needed only when there is a documented interaction between Effexor and the contraceptive method. For most users at 37.5mg, 75mg, 150mg, no backup is required. The pharmacist confirms whether Venlafaxine interacts with hormonal contraception.
More on Effexor
- With alcoholEffexor and alcohol — is it safe to drink?
- With foodShould Effexor be taken with food?
- Side effectsEffexor side effects: common, rare and warning signs
- Dosage guideEffexor dosage guide: how much to take and when
- OnsetHow fast does Effexor start working?
- DurationHow long does Effexor last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.