Plan B when planning pregnancy
For couples trying to conceive, every chronic medication deserves a careful pre-pregnancy review. Plan B (Levonorgestrel) at 1.5mg may need to be continued, switched, or stopped before conception, depending on the active ingredient Levonorgestrel and the indication. The right answer is rarely the same for everyone and rarely "just stop the medication."
Pre-conception review of Plan B
According to the prescribing information for Levonorgestrel, the pre-conception decision balances the risk of the medication during pregnancy against the consequences of leaving the underlying condition untreated. Some Hormones and Birth Control medications are continued safely through pregnancy; others are switched to safer alternatives before conception or in early pregnancy. Plan B's primary mechanism is delaying or preventing ovulation when taken before the LH surge.
Effect on fertility itself
Some medications affect fertility directly — by altering ovulation, sperm parameters, hormonal balance or libido. Whether Plan B has any documented effect on fertility depends on Levonorgestrel; the prescribing information notes any data. Anyone trying to conceive should discuss Plan B with the prescriber and a fertility specialist if conception is taking longer than expected.
Frequently asked questions
Should I stop Plan B before trying to conceive? ▾
It depends on Levonorgestrel and the indication. For some medications the answer is yes — switch to a safer alternative weeks before conception. For others, continuation is safe and preferable. The prescriber decides based on the full clinical picture.
Does Plan B affect male fertility? ▾
Effects on male fertility depend on the active ingredient. Some medications in Hormones and Birth Control affect sperm parameters or libido; others have no documented effect. The prescribing information for Levonorgestrel states what is known. If conception is delayed, a semen analysis can clarify whether Plan B is contributing.
More on Plan B
- With alcoholPlan B and alcohol — is it safe to drink?
- With foodShould Plan B be taken with food?
- Side effectsPlan B side effects: common, rare and warning signs
- Dosage guidePlan B dosage guide: how much to take and when
- OnsetHow fast does Plan B start working?
- DurationHow long does Plan B last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.