Medicines and Supplements in Pregnancy: What Is Safe?
Key message: Medicine safety is a balance: some drugs should be changed or avoided, while stopping essential treatment…
Key message: Medicine safety is a balance: some drugs should be changed or avoided, while stopping essential treatment can be more dangerous than continuing it. Review every prescription, pharmacy product, cream, inhaler and supplement.
Get urgent help: Seek urgent help after a medicine for breathing difficulty, facial or tongue swelling, collapse, severe rash or blistering, overdose, confusion or seizure. Contact a clinician promptly after accidental exposure to a medicine known to need pregnancy review; do not induce vomiting or stop essential treatment without advice.
What should be reviewed?
- Prescription tablets, injections, inhalers, eye drops, creams and patches.
- Painkillers, cold remedies, antacids and other pharmacy products.
- Vitamins, minerals, protein or weight-loss products.
- Herbal, traditional or ‘natural’ remedies.
- Recreational drugs, nicotine products and alcohol.
- Medicines used by the partner only when exposure or fertility is relevant.
Why should essential medicines not be stopped suddenly?
Uncontrolled epilepsy, asthma, diabetes, hypertension, thyroid disease, infection or severe mental illness can harm the mother and pregnancy. Some medicines require substitution or dose adjustment, but abrupt stopping can cause relapse or withdrawal.
Contact the prescriber as soon as pregnancy is planned or confirmed.
How is risk assessed?
The decision considers the exact drug, dose, route, pregnancy stage, illness being treated and available evidence. Labels such as ‘category A/B/C’ or isolated internet lists are too simplistic.
BUMPS/UKTIS and specialist guidance can support an individual decision; absence of perfect data does not automatically mean a medicine is unsafe.
Which supplements are commonly recommended?
- Folic acid 400 micrograms daily before conception and through 12 weeks for most people; 5 mg only for defined higher-risk indications.
- Vitamin D 10 micrograms daily in UK guidance, with local policy and deficiency treatment considered.
- Iron only when dietary intake, blood results or clinical need support it.
- Other supplements according to diet, deficiency, medical condition and local antenatal policy.
Which supplements should be avoided or checked?
- Vitamin A/retinol-containing supplements and liver products with high retinol.
- High-dose vitamins or minerals without a diagnosis.
- Herbal mixtures with uncertain ingredients or contamination risk.
- Bodybuilding, weight-loss or hormone products.
- Multiple products that duplicate folic acid, vitamin D, iodine or iron.
What about common pain, cold and allergy medicines?
Paracetamol is generally the first pain medicine when used correctly. NSAIDs such as ibuprofen need pregnancy-specific advice and are particularly avoided later in pregnancy. Decongestants, cough mixtures and antihistamines differ by ingredient.
Ask for the exact active ingredient rather than relying on a brand name.
What if I took a medicine before knowing I was pregnant?
Do not assume harm and do not stop medication automatically. Record the name, dose and dates and contact the prescriber, pharmacist, maternity team or a teratology-information service.
Many exposures are not an indication for pregnancy termination; risk assessment depends on the actual medicine and timing.
What changes after birth and during breastfeeding?
Pregnancy and breastfeeding safety are not identical. Some medicines avoided in pregnancy are compatible with breastfeeding and vice versa. Newborn prematurity and age also matter.
Create a postnatal medicine plan before discharge when ongoing treatment is needed.
Frequently asked questions
Does ‘natural’ mean safe?
No. Herbal products can have active ingredients, interactions and contamination.
Can I use a medicine I took in a previous pregnancy?
Recheck it because your health, dose and current guidance may differ.
Should I stop antidepressants when pregnant?
Not without specialist advice; relapse can be serious and treatment is individual.
Are supplements always beneficial?
No. More is not always better, and high doses can cause harm.
Where can medicine safety be checked?
Use your prescriber or pharmacist and recognised resources such as BUMPS/UKTIS rather than social media.
Your next step
Bring every medicine and supplement—or photographs of their labels—to the preconception or first pregnancy visit. Do not stop essential treatment or start a new product without an individual review.
Medical and content review: Dr Mohamed Abdelghany, Obstetrics & Gynecology Specialist, MRCOG (UK), MSc Obstetrics & Gynecology – Kasr Al-Ainy, Cairo University.
Last reviewed: 23 August 2026.
This information is for general education and does not replace individual medical assessment. Severe, sudden or concerning symptoms should not wait for a routine appointment.
