Paxil 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 Paxil (Paroxetine). The combination is generally fine at 10mg, 20mg, 30mg, 40mg, but a small number of medications can reduce contraceptive efficacy meaningfully and need either a backup method or a switch.
How Paxil 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 Paroxetine acts on CYP3A4 determines whether Paxil affects contraception. Most agents in Anti-Depressants have no clinically meaningful effect on the pill at 10mg, 20mg, 30mg, 40mg.
Practical guidance
According to the prescribing information for Paroxetine, women on hormonal contraception should review Paxil 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 Paxil therapy is the standard mitigation.
Frequently asked questions
Will Paxil make my pill less effective? ▾
Most Anti-Depressants medications at 10mg, 20mg, 30mg, 40mg do not affect oral contraceptive efficacy. The exceptions are CYP3A4-inducing drugs and a small number of others. The prescribing information for Paroxetine states whether the interaction is meaningful.
Do I need a backup contraceptive on Paxil? ▾
Backup contraception is needed only when there is a documented interaction between Paxil and the contraceptive method. For most users at 10mg, 20mg, 30mg, 40mg, no backup is required. The pharmacist confirms whether Paroxetine interacts with hormonal contraception.
More on Paxil
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