Review medicines and supplements as soon as you start planning a pregnancy—ideally before you stop contraception or begin trying. There is no universal rule that everyone must review them a set number of months beforehand. A few months of lead time can be useful when a medicine needs a gradual change, a replacement needs time to work, a health condition needs monitoring, or a specific drug has a required washout period. If you are already trying, book the review now rather than waiting for a pregnancy test.
This timing is different from the folic acid recommendation: the CDC advises 400 micrograms (mcg) of folic acid daily, with enough in the body at least one month before conception and during early pregnancy. That one-month advice applies to folic acid; it is not a general medication-review deadline. Your own plan depends on the medicines, the reason you take them, your health history, and how quickly a safe alternative can be established.
Medication decisions can involve both the exposure and the condition being treated. Some medicines can affect a developing pregnancy, but stopping an effective treatment can also allow a condition to worsen. The CDC advises people who are pregnant or thinking about pregnancy to talk with their health care providers before starting or stopping medicines. It notes that avoiding or stopping a medicine can sometimes be more harmful than taking it. A clinician can compare the risks of continuing, changing, tapering, or stopping and decide whether monitoring is needed.
That conversation is most useful before conception because some changes cannot be completed in a day. A new treatment may need time to reach a stable dose; a long-term medicine may need a supervised taper; and a condition such as epilepsy, diabetes, high blood pressure, thyroid disease, or depression may need follow-up after a change. These examples do not mean that a person with any of these conditions cannot have a healthy pregnancy. They explain why the prescriber and prenatal care team may need to coordinate a plan before trying.
The American College of Obstetricians and Gynecologists (ACOG) recommends that potentially teratogenic medicines—those that can harm an embryo or fetus—be adjusted with the prescribing clinician before contraception is discontinued. Its guidance is about coordinated planning, not an instruction to stop every medicine. See ACOG’s prepregnancy counseling guidance and the CDC’s Medicine and Pregnancy overview.
A washout period is the time a person may need to wait after the last dose before attempting pregnancy. Whether one is needed—and how long it should be—depends on the specific drug, its label, and the person’s medical circumstances. Some medicines may be continued with a monitoring plan; others may need a planned switch or a waiting period. Do not apply one medicine’s schedule to another.
For example, the U.S. prescribing information for Wegovy (semaglutide), revised in June 2026, says patients taking it for weight reduction or cardiovascular risk reduction should discontinue it at least two months before a planned pregnancy. The label uses additional benefit-risk language for its MASH indication, underscoring that instructions can depend on why the medicine is prescribed. This interval is specific to Wegovy, not a two-month rule for all weight-loss medicines or all prescriptions. If you take semaglutide for weight reduction, cardiovascular risk reduction, or another condition, ask the prescriber how to manage both the medicine and the condition during the transition. The current Wegovy prescribing information contains the labeled timing.
Other medicines can have different instructions, and pregnancy safety information is incomplete for many products. Limited data do not automatically mean a medicine is harmful; they do mean that a search result or a general “safe/unsafe” list may not answer an individual question. FDA advises making a medicine plan with a health care provider before pregnancy and checking prescription labels for the known risks and available information. Ask the clinician who prescribes the medicine, an obstetric clinician, or a pharmacist to help interpret the information together.
Bring a complete list, even if a product seems minor or is used only occasionally. Include:
Photographs of labels can help if you do not have the packages. Include the active ingredient when a brand name is unclear. “Natural” does not guarantee safety, and supplements can contain several ingredients or doses that are not obvious from the front label. The FDA recommends discussing medicines, dietary supplements, and vitamins before use and cautions that prenatal vitamins can have too much or too little of what a particular person needs. Ask whether a product should be continued, replaced, or paused rather than assuming every supplement is appropriate.
For most people planning pregnancy, CDC guidance is to get 400 mcg of folic acid every day. Having enough at least one month before conception and during early pregnancy helps reduce the risk of neural tube defects, which affect the developing brain and spine. Start when you begin planning instead of waiting for a positive test. The CDC’s Planning for Pregnancy guidance gives this recommendation.
Some people may need an individualized folic acid dose or a different supplement plan because of their medical history or medicines. Do not take a high dose on your own or combine several products without checking the total amount. Review the ingredient panel with a clinician or pharmacist, especially if you take prescription medicines that could interact with supplements. For details on the usual recommendation and exceptions, see the CDC’s About Folic Acid guidance.
| Your situation | What it may mean | Useful next step |
|---|---|---|
| You take a stable prescription for a chronic condition | The medicine may be continued, changed, or monitored; the condition also matters | Ask the prescribing clinician and prenatal care provider to make a shared plan before trying |
| You use several supplements or herbal products | Ingredients, dose, evidence, and interactions may be unclear | Bring bottles or label photos and review each ingredient |
| You take a medicine with a specific pregnancy warning or washout | A fixed product-specific timeline may apply | Check the current prescribing information and contact the prescriber before trying |
| You are already trying or have a positive test | The ideal preconception window may have passed, but a review is still useful | Contact your clinician promptly; do not stop essential medicine on your own |
Contact the prescriber soon—before further attempts if possible—if you take a medicine with a known pregnancy-prevention program, a product-specific washout period, or a label warning about pregnancy. If you have a positive pregnancy test while taking a medicine with such a warning, contact the prescriber and prenatal care team promptly for instructions. FDA’s current iPLEDGE information for isotretinoin is an example of a medicine-specific risk-management program; follow the current program and the prescriber’s instructions.
Also reach out promptly if you have stopped a chronic medicine because you fear pregnancy exposure, if symptoms of the condition are returning, or if you cannot reach the clinician who prescribed it. Do not abruptly stop or restart a prescription, double doses, or substitute a supplement without advice. If a pregnancy has already begun before a review, an exposure alone does not tell you what will happen; a clinician can interpret the exact product, dose, and timing and advise whether any follow-up is needed.
The practical rule is simple: start the conversation when pregnancy becomes a goal, not after you discontinue contraception. A few months may be helpful when a change takes planning, but there is no universal three-month requirement. The right timetable is the one written for your specific medicines and health needs in consultation with your care team. This is general information, not a diagnosis or a personal medication plan.
Guidance checked September 30, 2026. CDC’s Planning for Pregnancy page was updated July 14, 2026; the Wegovy prescribing information cited here was revised June 2026. Medication labels and recommendations can change, so confirm the latest instructions with a clinician or pharmacist.
Review medicines and supplements before trying to conceive. Learn why timing varies, when drug-specific washouts apply, and what to ask your clinician.
Article by Student Nguyen Hoang Yen about amniotic fluid. It has several functions that are necessary for the normal development and growth of the fetus.
