Medicines in Pregnancy: Complete Guide
Working out which medicines are safe to take in pregnancy can feel confusing, especially when packet leaflets simply say "consult your doctor" without offering any real guidance. This overview covers the general principles, common examples of what's usually considered safe versus best avoided, and where to find reliable, up-to-date information for anything not covered here.
The Golden Rule
Never assume a medicine is safe in pregnancy just because it's available over the counter or you've taken it before without issue. Pregnancy changes how your body processes many drugs, and some medicines that are fine for most adults can pose risks to a developing baby, particularly in the first trimester when organs are forming. Always check with your GP, midwife, or pharmacist before starting anything new — pharmacists are an easily accessible first port of call and can often answer questions on the spot. For anything not covered by a quick chat, the BUMPS website (bestuseofmedicines.org, run by the UK Teratology Information Service) has plain-English fact sheets on specific medicines in pregnancy.
Generally Considered Safe
- Paracetamol — the go-to painkiller and fever reducer throughout pregnancy at standard doses
- Some antibiotics — penicillin-based antibiotics (like amoxicillin) are commonly prescribed in pregnancy when needed; always take antibiotics prescribed specifically for your pregnancy rather than leftover courses
- Some antihistamines — loratadine and cetirizine are generally considered suitable options for hay fever or allergies, though check with your pharmacist first
- Antacids and indigestion remedies — most standard antacids are fine for heartburn, which is extremely common in pregnancy
- Certain laxatives — bulk-forming options like ispaghula husk (Fybogel) are generally considered safe for constipation
Best Avoided or Used With Caution
- Ibuprofen and other NSAIDs — not recommended in pregnancy, and specifically avoided from around 30 weeks due to risks to the baby
- Aspirin — avoided at standard painkiller doses; low-dose aspirin is sometimes prescribed for specific medical reasons, but only under medical supervision
- Codeine, especially in the third trimester or close to delivery, due to effects on the baby
- Some antibiotics — tetracyclines are generally avoided as they can affect a baby's developing teeth and bones
- Retinol and vitamin A supplements — high-dose vitamin A and retinoid-based skincare are avoided due to birth defect risk; this includes some acne treatments
- Herbal and "natural" remedies — being herbal doesn't automatically mean safe; many haven't been tested in pregnancy, so check before using them
If you're on regular medication for a pre-existing condition, don't stop taking it without medical advice — for many conditions, an unmanaged illness poses a greater risk than the medicine itself. Speak to your GP or specialist about your specific situation as early as possible in pregnancy, ideally even before conceiving if you're planning one.
Frequently Asked Questions
How do I know if a medicine is safe to take in pregnancy?
Always check with your GP, midwife, or pharmacist before taking any medicine, including over-the-counter products, during pregnancy. The BUMPS website (bestuseofmedicines.org) and the NHS website both offer reliable, specific guidance on individual medicines. Never assume something is safe simply because it doesn't require a prescription.
What medicines should I avoid in pregnancy?
Commonly avoided medicines include ibuprofen and other NSAIDs, aspirin at standard doses, codeine (particularly later in pregnancy), tetracycline antibiotics, and high-dose vitamin A or retinol-based products. This isn't a complete list, so always confirm with a pharmacist or GP before taking anything you're unsure about, including herbal remedies.
Can I keep taking my regular prescription medicine once I find out I'm pregnant?
In many cases, yes — stopping a medicine for a pre-existing condition without medical advice can be riskier than continuing it, since an unmanaged condition can itself affect the pregnancy. Contact your GP or specialist as soon as possible to review your medication together rather than stopping abruptly on your own.
This article is for informational purposes only and does not constitute medical advice.
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