Yes, many hay fever tablets are considered safe in pregnancy, but only some types are recommended, and you should always check with your doctor or midwife first.

What is generally considered safe

  • Non‑drowsy antihistamine tablets such as loratadine (e.g. Clarityn/Allereze) and cetirizine (e.g. Piriteze, Zyrtec) are widely regarded as the preferred options in pregnancy when symptoms are troublesome.
  • These are usually taken at standard adult doses and are not known to cause harm in most studies, though long‑term “no‑risk” data is still limited.

What to avoid or use with caution

  • Sedating (drowsy) antihistamines like chlorphenamine (e.g. Piriton, Hayleve) can be used in pregnancy but are usually second‑choice because of sleepiness and possible newborn side effects late in the third trimester.
  • Decongestant tablets (often combined with antihistamines, e.g. pseudoephedrine) are generally not recommended , especially in early pregnancy, because they may affect blood flow to the baby.

Practical tips during pregnancy

  • Start with non‑tablet options where possible:
    • Saline nasal sprays or washes
    • Wrap‑around sunglasses to reduce pollen in the eyes
    • Keeping windows closed, showering after being outside, and using air‑filter apps to track pollen counts
  • Always read the label and ask your pharmacist: many “hay fever relief” products contain decongestants or multiple ingredients that aren’t advised in pregnancy.

When to speak to a professional

  • If you’re already on a regular hay fever tablet, talk to your GP or midwife before continuing or changing it.
  • Seek urgent help if you get wheezing, chest tightness, or other breathing problems , as this may be more than simple hay fever and needs different treatment.

In short: You can often take certain hay fever tablets (especially loratadine or cetirizine) when pregnant, but not all brands or combinations are safe—so run your exact medicine past a healthcare professional before taking it.

Information gathered from public forums or data available on the internet and portrayed here.