Two questions come up in nearly every prenatal visit I have: which prenatal vitamin should I take, and is it safe to take this medication now that I am pregnant. Both deserve clear answers, because the anxiety around them is real, and because good information changes outcomes. The stakes of taking the right vitamin at the right time are high, and so are the stakes of a woman suffering through a fever or a migraine because she is afraid to take something that is, in fact, safe.
Let me walk through what the evidence actually supports on both fronts, starting with prenatal vitamins, and then turning to the medications patients ask about most, including the acetaminophen question that has caused so much confusion recently.
What are prenatal vitamins, and do you need one?
A prenatal vitamin is a pregnancy-specific multivitamin designed to fill the nutritional gaps that are hardest to meet through diet alone during pregnancy. The most important ingredient is folic acid, which reduces the risk of neural tube defects, serious birth defects of the brain and spine, by a substantial margin.1 Because these defects form in the very first weeks of pregnancy, often before a woman knows she is pregnant, the timing of when you start matters as much as the vitamin itself.
Yes, you need one if you are pregnant or trying to conceive. The American College of Obstetricians and Gynecologists recommends a daily prenatal vitamin with at least 400 micrograms of folic acid, started at least one month before conception and continued through pregnancy.2 Diet alone rarely provides enough folic acid, which is why the supplement is recommended even for women who eat well.
What to look for in a prenatal vitamin
Prenatal vitamins are not standardized, so labels vary widely. These are the nutrients that matter most, with the amounts ACOG and related guidance support:10
| Nutrient | Why it matters | Target amount |
|---|---|---|
| Folic acid (folate) | Prevents neural tube defects; the single most important ingredient | At least 400 mcg (600 mcg total daily in pregnancy) |
| Iron | Supports the increased blood volume of pregnancy; prevents anemia | About 27 mg |
| Iodine | Needed for fetal brain and thyroid development | About 150 mcg |
| Calcium and vitamin D | Bone development | Calcium 1,000 mg; vitamin D 600 IU |
| DHA (omega-3) | Supports fetal brain and eye development | About 200-300 mg |
| Choline | Brain development; often underdosed or missing in prenatals | 450 mg (frequently not met; consider diet or a separate source) |
A note on choline, because it is the nutrient most often shortchanged: most prenatal vitamins contain little or none of the 450 milligrams recommended in pregnancy, even though it is important for fetal brain development.7 Eggs, meat, and dairy are good dietary sources. If yours is low, that is a reasonable thing to discuss with your clinician rather than doubling up on vitamins.
When to start and how long to continue
Start at least one month before you try to conceive, ideally three months, and continue through pregnancy and while breastfeeding. Because roughly half of pregnancies are unplanned, ACOG and the CDC recommend that all women of reproductive age who could become pregnant take folic acid daily, whether or not they are actively trying.3,8 That is the single most effective window for preventing neural tube defects, and it closes early.
Can you take prenatal vitamins without being pregnant?
Yes, and it is safe to do so. There is nothing harmful about taking a prenatal vitamin when you are not pregnant, and it is exactly what I recommend for women who are trying to conceive or who could become pregnant. What prenatal vitamins will not do is grow your hair or strengthen your nails in any proven way; those popular claims are not supported by good evidence. If you are taking one for hair and nails rather than for pregnancy, a regular multivitamin is usually a better fit, mostly because prenatals carry more iron than a non-pregnant body needs, which can cause constipation.
Common side effects and how to manage them
The two most common complaints I hear about prenatal vitamins are nausea and constipation, and both are usually manageable. Iron is usually behind both. If your prenatal makes you queasy, taking it with food or at bedtime often helps; for constipation, staying well hydrated and keeping fiber and light activity up usually eases it. If a particular formulation is intolerable, there are many alternatives, including gummies, though gummy prenatals often lack iron and sometimes other nutrients, so check the label. The point is that side effects are a reason to adjust, not to stop taking a prenatal altogether.
Which medications are safe during pregnancy?
This is where I spend a lot of visit time, because fear of medications leads many women to endure symptoms they do not need to endure. No medication is entirely without consideration in pregnancy, but many are well studied and considered safe when used appropriately. Here is a practical overview of the common ones.
| Symptom | Generally considered safe | Generally avoided |
|---|---|---|
| Pain and fever | Acetaminophen (Tylenol) | Ibuprofen (Advil), naproxen (Aleve), aspirin unless prescribed |
| Allergies | Loratadine (Claritin), cetirizine (Zyrtec), diphenhydramine (Benadryl) | — |
| Heartburn | Calcium carbonate (Tums), famotidine (Pepcid), omeprazole | — |
| Nausea | Vitamin B6, doxylamine (Unisom), prescription options for severe cases | — |
| Constipation | Psyllium, polyethylene glycol (MiraLAX), docusate | — |
| Cold and cough | Saline spray, acetaminophen, plain guaifenesin after the first trimester | Decongestant pseudoephedrine in the first trimester |
The most important item in that table is the one drawing headlines, so it deserves its own section.
The acetaminophen (Tylenol) question
In September 2025, a federal announcement suggested that taking acetaminophen during pregnancy might raise the risk of autism in children. That message spread quickly, and it frightened a lot of pregnant women. I want to give you the medical picture as clearly as I can, because the anxiety it created is doing its own harm.
The major medical bodies, including the American College of Obstetricians and Gynecologists and the Society for Maternal-Fetal Medicine, responded that the current weight of evidence does not support a causal link between acetaminophen use in pregnancy and autism or ADHD.4,5 The strongest available study, a Swedish population-based analysis of nearly 2.5 million children published in JAMA in 2024, found no increased risk once familial and genetic factors were accounted for, suggesting that earlier reported associations were likely explained by confounding rather than by the medication itself.6
The opposite risk matters just as much: untreated fever and pain in pregnancy carry real dangers. A high fever in early pregnancy is itself associated with birth defects and miscarriage, and acetaminophen remains the first-line option for treating fever and pain in pregnancy precisely because the alternatives carry more concern.4,9 ACOG's position is that women should use acetaminophen judiciously, at the lowest effective dose for the shortest time needed, as with any medication, but should not be afraid to treat a genuine fever or significant pain.
Medications to be cautious with
A few categories do warrant caution or avoidance. NSAIDs like ibuprofen and naproxen are generally avoided, especially in the third trimester, where they can affect fetal circulation and kidney function. Certain prescription medications, including some for acne (isotretinoin), some blood pressure drugs (ACE inhibitors), and some mood and seizure medications, require careful review and sometimes substitution before or during pregnancy. This does not mean stopping a needed medication on your own; abruptly stopping some drugs is more dangerous than continuing them. It means having the conversation with your clinician, ideally before conception, since drug labels now carry narrative pregnancy risk information rather than the old letter categories.11
The GLP-1 medications for weight and diabetes, such as semaglutide, are not recommended during pregnancy and are generally stopped before trying to conceive; if this applies to you, it is worth discussing timing and alternatives with your clinician.
What I tell patients
Start a prenatal vitamin before you are pregnant. The most important window for folic acid is the first few weeks, often before a positive test, so start when you begin trying, or sooner.
Folic acid is the priority; choline is the one to watch. Make sure your prenatal has adequate folic acid, and know that choline is commonly underdosed and worth getting from diet.
Do not double up on vitamins. One prenatal is enough. Two multivitamins can push vitamin A and other nutrients into harmful territory.
Do not suffer needlessly over safe medications. Acetaminophen for fever and pain, and several allergy, heartburn, and nausea options, are well studied and appropriate. Untreated fever is a real risk.
On the acetaminophen news: treat your fever. The strongest evidence does not support the autism link, and an untreated high fever is dangerous. Use it judiciously and ask if you are unsure.
Never stop a prescribed medication on your own. Some are riskier to stop than to continue. Bring the list to your provider, ideally before pregnancy, and decide together.
Frequently asked questions
When should I start taking prenatal vitamins?
Start at least one month before trying to conceive, and ideally three months ahead. Because neural tube defects form in the first few weeks of pregnancy, often before a positive test, ACOG recommends that all women who could become pregnant take folic acid daily. Continue the prenatal through pregnancy and while breastfeeding.
Can you take prenatal vitamins without being pregnant?
Yes, it is safe. Prenatal vitamins are recommended for anyone trying to conceive or who could become pregnant. They will not reliably grow hair or nails despite popular claims. If you are not pregnant and not trying, a regular multivitamin is often a better fit, since prenatals contain more iron than a non-pregnant body needs, which can cause constipation.
Is Tylenol (acetaminophen) safe during pregnancy?
Major medical organizations, including ACOG and the Society for Maternal-Fetal Medicine, state that acetaminophen remains the first-line pain and fever reliever in pregnancy and that current evidence does not support a causal link to autism or ADHD. The strongest study, a 2024 analysis of nearly 2.5 million children, found no increased risk after accounting for familial factors. Use it judiciously, at the lowest effective dose, and do not leave a high fever untreated.
What pain reliever can I take while pregnant?
Acetaminophen (Tylenol) is the pain and fever reliever considered safe in pregnancy when used appropriately. NSAIDs like ibuprofen (Advil) and naproxen (Aleve), and aspirin unless specifically prescribed, are generally avoided, particularly in the third trimester. Always use the lowest effective dose and check with your clinician about your specific situation.
What can I take for a cold or allergies while pregnant?
For allergies, second-generation antihistamines like loratadine (Claritin) and cetirizine (Zyrtec) are generally considered safe, as is diphenhydramine (Benadryl). For colds, saline spray, acetaminophen for aches, and plain guaifenesin after the first trimester are reasonable. The decongestant pseudoephedrine is usually avoided in the first trimester. Confirm choices with your provider.
Do prenatal vitamins have side effects?
The most common side effects are nausea and constipation, usually from the iron. Taking the vitamin with food or at bedtime can ease nausea, and water, fiber, and movement help with constipation. If one formulation does not agree with you, alternatives exist, including gummies, though gummy prenatals often lack iron. Side effects are a reason to adjust, not to stop.
References
- Centers for Disease Control and Prevention. Folic Acid: recommendations and prevention of neural tube defects. Updated 2024. cdc.gov
- American College of Obstetricians and Gynecologists. Nutrition During Pregnancy: FAQ, including prenatal vitamins, folic acid, iron, calcium, vitamin D, choline, and omega-3s. 2026. acog.org
- American College of Obstetricians and Gynecologists. Good Health Before Pregnancy: Prepregnancy Care, including daily folic acid for all women who could become pregnant. acog.org
- American College of Obstetricians and Gynecologists. Acetaminophen Use in Pregnancy and Neurodevelopmental Outcomes. Practice Advisory, September 2025. acog.org
- Society for Maternal-Fetal Medicine. SMFM Response to Administration Announcement on Acetaminophen Use During Pregnancy and Autism. September 2025. smfm.org
- Ahlqvist VH, Sjöqvist H, Dalman C, Karlsson H, Stephansson O, Johansson S, Magnusson C, Gardner RM, Lee BK. Acetaminophen use during pregnancy and children's risk of autism, ADHD, and intellectual disability. JAMA. 2024;331(14):1205-1214. doi:10.1001/jama.2024.3172. PMID 38592388
- Institute of Medicine (National Academy of Medicine). Dietary Reference Intakes: choline, folate, and B vitamins in pregnancy. Reference values. nih.gov
- US Preventive Services Task Force. Folic Acid Supplementation to Prevent Neural Tube Defects: US Preventive Services Task Force Recommendation Statement. JAMA. 2023;330(5):454-459. PMID 37526713
- American College of Obstetricians and Gynecologists. Headaches in Pregnancy and Postpartum: Clinical Practice Guideline No. 3. Obstet Gynecol. 2022;139(5):944-972. PMID 35576364
- National Institutes of Health Office of Dietary Supplements. Dietary Supplements for Pregnancy: Health Professional Fact Sheet. 2026. ods.od.nih.gov
- US Food and Drug Administration. Pregnancy and Lactation Labeling (Drugs) Final Rule (PLLR): removal of letter categories and narrative risk labeling. 2015, in effect 2026. fda.gov
This article is educational and does not constitute medical advice or establish a physician-patient relationship. Medication and supplement decisions in pregnancy should be individualized with a qualified clinician who knows your history. Consult your own obstetric provider before starting, stopping, or changing any medication or supplement.