The avoid list: NSAIDs (ibuprofen, naproxen, regular aspirin) after 20 weeks, isotretinoin, ACE inhibitors and ARBs, valproate, warfarin, weight-loss drugs including GLP-1s, and high-dose vitamin A. Acetaminophen is the default pain reliever.
The reasoning: NSAIDs after 20 weeks risk fetal kidney problems and early closure of a heart vessel, per the FDA; isotretinoin causes severe birth defects, which is why the iPLEDGE prevention program exists. The caution middle: pseudoephedrine (first-trimester avoid), Pepto-Bismol and other salicylates, herbal supplements, and caffeine over about 200 mg daily. Two meta-rules beat memorizing: check anything new with your OB, pharmacist, or MotherToBaby first, and never stop a necessary medication on your own, because untreated depression, asthma, or seizures often outrisk the drug; the right move is adjusting together with your prescriber. Planning ahead is the real win: a preconception visit lets you swap problem medications before they matter.
What to do
Common questions
What cant you take while pregnant?
The avoid list is shorter than people fear, but the items on it matter. The big categories, per FDA pregnancy-medication guidance: NSAIDs, ibuprofen and naproxen and regular-dose aspirin, are out after 20 weeks (they can cause fetal kidney problems and low amniotic fluid, and later can close a fetal heart vessel early); acetaminophen is the standard pain reliever instead. Isotretinoin (Accutane) causes severe birth defects and requires a prevention program (iPLEDGE) precisely because pregnancy on it is an emergency. Blood-pressure drugs in the ACE inhibitor and ARB families (lisinopril, losartan) are out; pregnancy-compatible options like labetalol exist. Valproate (seizures, bipolar) and warfarin are on the list, with planned substitutions before conception. Most weight-loss drugs, including GLP-1s like Wegovy and Zepbound, are out. High-dose vitamin A and retinoid-containing supplements are out. The caution-not-forbidden middle: decongestants like pseudoephedrine (avoid in the first trimester), salicylate stomach remedies like Pepto-Bismol, herbal supplements (unregulated, some unsafe; St. John's wort interacts widely), and high-dose caffeine (cap at about 200 mg a day). The meta-rule that beats memorizing lists: before taking anything, prescription, OTC, or supplement, run it past your OB, midwife, or pharmacist, or check MotherToBaby's fact sheets, and never stop a necessary medication (antidepressants, asthma inhalers, seizure meds) on your own, because untreated illness is often the bigger pregnancy risk; the move is to call your prescriber and adjust together.