What allergy medication is safe while pregnant is one of the most common questions asked by expectant mothers managing hay fever, allergic rhinitis, urticaria, or eczema. Pregnancy can alter allergy symptoms, making effective management essential — yet some standard treatments carry potential risks to the developing foetus. UK guidance from the NHS, NICE, and the MHRA emphasises using the lowest effective dose of the safest available treatment for the shortest necessary duration. This article outlines which antihistamines and other allergy treatments are considered safe, which to avoid, and when to seek advice from your GP or midwife.

Managing Allergies During Pregnancy in the UK

Allergies are common during pregnancy, and many women find that their symptoms — including hay fever, allergic rhinitis, urticaria (hives), and atopic eczema — either persist or change in severity throughout the trimesters. Managing these conditions safely requires careful consideration, as some medications that are routinely used outside of pregnancy may carry potential risks to the developing foetus. It is worth noting that atopic eczema is a condition of skin barrier dysfunction and immune dysregulation; whilst it often co-exists with allergic conditions, it is not always caused by a specific allergen.

In the UK, guidance from the NHS, the Medicines and Healthcare products Regulatory Agency (MHRA), and the National Institute for Health and Care Excellence (NICE) emphasises a cautious, evidence-based approach to prescribing during pregnancy. The general principle, as set out in NICE's antenatal care guideline (NG201), is to use the lowest effective dose of the safest available treatment for the shortest necessary duration.

It is important to note that untreated allergies can also pose risks. Severe allergic reactions, sleep disruption, and uncontrolled asthma triggered by allergens can all affect maternal and foetal wellbeing. Continuing prescribed inhaled or intranasal corticosteroids is generally recommended unless a healthcare professional advises otherwise, as stopping them abruptly can lead to a deterioration that may be more harmful than the treatment itself. The goal is not necessarily to avoid all treatment, but to make informed, proportionate decisions in consultation with a healthcare professional. Women should always disclose their pregnancy — or plans to become pregnant — when seeking advice about allergy management.

Which Antihistamines Are Considered Safe in Pregnancy?

Antihistamines are among the most commonly used allergy medications, and their safety profile in pregnancy varies depending on the specific agent and the trimester of use. In the UK, loratadine and cetirizine are the two non-sedating (second-generation) antihistamines most frequently recommended during pregnancy and are considered equivalent first-line options. Both are available over the counter at standard adult doses (loratadine 10 mg once daily; cetirizine 10 mg once daily), have a relatively reassuring body of evidence, and have no confirmed association with foetal harm when used at recommended doses. Always follow the label instructions and seek pharmacist or GP advice before starting either medicine.

Older, sedating (first-generation) antihistamines such as chlorphenamine (Piriton) have been used for decades and are sometimes recommended for short-term use or when non-sedating options are insufficient. However, if taken in large doses close to the due date, they may cause neonatal drowsiness or irritability. Use near term should therefore be discussed with a GP or midwife.

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Fexofenadine is another non-sedating antihistamine, but data on its use in pregnancy are more limited. It is not usually recommended as a first-line option and should only be considered on the advice of a clinician. Hydroxyzine and promethazine are sedating antihistamines that are generally avoided for allergy management in pregnancy; if you have been prescribed either, discuss this with your GP.

Sodium cromoglicate eye drops are considered safe to use during pregnancy and are a useful option for allergic conjunctivitis, helping to relieve itchy, watery eyes without the need for systemic antihistamines.

Key points to remember:

• Loratadine and cetirizine are both suitable first-line antihistamines in pregnancy at standard doses

• Chlorphenamine may be used short-term but with caution near the due date; seek medical advice

• Fexofenadine should only be used on clinician advice due to limited pregnancy data

• Sodium cromoglicate eye drops are a safe topical option for allergic eye symptoms

• Avoid 'all-in-one' or combination cold and allergy products, which may contain decongestants

• Always check with a pharmacist or GP before starting any antihistamine

• If you experience a suspected side effect from any medicine, report it to the MHRA via the Yellow Card scheme (search 'MHRA Yellow Card' online or ask your pharmacist)

Allergy Treatments to Avoid When Pregnant

Certain allergy medications are contraindicated or not recommended during pregnancy due to evidence of potential harm or insufficient safety data. Understanding which treatments to avoid is just as important as knowing which are considered safe.

Oral decongestants, such as pseudoephedrine and phenylephrine, are commonly found in combination cold and allergy remedies. The NHS and the UK Teratology Information Service (UKTIS) advise avoiding these medicines during pregnancy — particularly in the first trimester — due to their vasoconstrictive properties and a theoretical association with a small increased risk of certain birth defects. Many pharmacists will decline to recommend them to pregnant women. If you are unsure whether a product contains a decongestant, ask your pharmacist before purchasing.

Intranasal decongestant sprays (e.g., xylometazoline) are generally best avoided in pregnancy due to limited safety data and the risk of rebound congestion with prolonged use. If their use is considered necessary, this should be for a very short course (no more than 2–3 days) and only on the advice of a clinician or pharmacist.

Intranasal corticosteroid sprays — such as beclometasone, budesonide, and fluticasone — are a different matter. These are considered acceptable for use in pregnancy at standard therapeutic doses, as systemic absorption is minimal. They may be appropriate when antihistamines alone are insufficient for allergic rhinitis. High-dose systemic (oral or injectable) corticosteroids should only be used when the clinical benefit clearly outweighs the risks, and always under medical supervision.

Regarding allergen immunotherapy (desensitisation), BSACI and specialist allergy guidelines advise that this treatment should not be initiated during pregnancy due to the risk of anaphylaxis. However, women who are already established on a maintenance immunotherapy regimen — including venom immunotherapy — may, in some cases, continue under specialist supervision.

Additionally, many herbal remedies marketed for allergy relief — including butterbur and certain traditional preparations — lack adequate safety data in pregnancy and should be avoided unless specifically approved by a healthcare professional.

Non-Medication Approaches to Relieving Allergy Symptoms

For many pregnant women, non-pharmacological strategies can significantly reduce allergy symptoms and minimise the need for medication. These approaches are safe, evidence-informed, and recommended as first-line measures by NHS guidance.

For hay fever and allergic rhinitis:

• Apply a small amount of Vaseline (petroleum jelly) around the nostrils to trap pollen

• Wear wraparound sunglasses outdoors to reduce eye exposure to pollen

• Shower and change clothes after being outside to remove pollen

• Keep windows and doors closed during high pollen periods

• Monitor the pollen forecast and limit outdoor activity on high-count days

• Barrier nasal sprays containing cellulose powder (e.g., Nasaleze) can help trap and block airborne allergens and are considered safe in pregnancy

• HEPA air purifiers may help reduce indoor airborne allergens for some people, though the evidence for their benefit is variable; they are an optional measure rather than a firm recommendation

Nasal saline irrigation (e.g., using a saline nasal spray or rinse) is a safe and effective way to rinse allergens from the nasal passages and reduce congestion. This is widely recommended during pregnancy and can be used as often as needed.

For allergic eye symptoms, sodium cromoglicate eye drops (see antihistamine section) are a safe topical option alongside physical measures such as cold compresses and avoiding rubbing the eyes.

For allergic skin conditions such as urticaria or atopic eczema, emollient moisturisers remain the cornerstone of management and are safe throughout pregnancy. If emollients alone are insufficient, topical corticosteroids may be used during pregnancy at the lowest effective potency for the shortest necessary duration, on the advice of a clinician. Avoiding known triggers — such as certain fabrics, soaps, or foods — is also important.

Maintaining good indoor air quality by reducing dust mite exposure (using allergen-proof bedding covers, washing bedding at 60°C, and vacuuming regularly) can also make a meaningful difference for those with perennial allergic rhinitis or asthma. These measures, combined with appropriate medical treatment where necessary, form a comprehensive and pregnancy-safe allergy management plan.

When to Seek Advice from Your GP or Midwife

Whilst mild allergy symptoms can often be managed with over-the-counter remedies and self-care measures, there are circumstances in which it is important to seek prompt advice from your GP, midwife, or — in emergencies — call 999.

Contact your GP or midwife if:

• Your allergy symptoms are severe, persistent, or worsening despite self-care

• You are unsure whether a medication is safe to take during your pregnancy

• You develop new symptoms that could indicate a more serious allergic reaction, such as widespread hives, facial swelling, or difficulty breathing

• Your asthma is poorly controlled or triggered by allergens — this requires urgent review, as uncontrolled asthma in pregnancy carries significant risks

• You have a history of suspected food, drug, or venom allergy, recurrent anaphylaxis, or chronic urticaria that has not responded to standard treatment — your GP may refer you to a specialist allergy clinic

• You experience anaphylaxis — this is a medical emergency; call 999 immediately and use your adrenaline auto-injector (e.g., EpiPen) if one has been prescribed. Intramuscular adrenaline is the recommended and safe treatment for anaphylaxis in pregnancy. If you have been prescribed an auto-injector, carry two devices at all times

If you need urgent advice and it is not a 999 emergency, contact NHS 111 (online at 111.nhs.uk or by phone).

It is also worth discussing allergy management at your booking appointment or early antenatal visits, particularly if you have a known history of severe allergies, asthma, or are currently on allergen immunotherapy. Your GP can review your existing medications and advise on any adjustments needed for pregnancy.

Do not stop prescribed allergy or asthma medications abruptly without medical advice, as this can lead to a deterioration in your condition that may be more harmful than the medication itself. A shared decision-making conversation with your healthcare team will help you weigh up the benefits and risks in the context of your individual circumstances.

NICE and NHS Guidance on Allergy Treatment in Pregnancy

In the UK, guidance on allergy management during pregnancy is informed by several authoritative bodies, including NICE, the NHS, the MHRA, the UK Teratology Information Service (UKTIS), and the British Society for Allergy and Clinical Immunology (BSACI). Whilst there is no single dedicated NICE guideline exclusively covering allergy medication in pregnancy, relevant recommendations are embedded within guidelines and Clinical Knowledge Summaries (CKS) on antenatal care, allergic rhinitis, urticaria, and asthma management.

NICE's guideline on antenatal care (NG201) emphasises the importance of reviewing all medications at the earliest opportunity in pregnancy and ensuring that any treatment is evidence-based and proportionate. The NHS advises that loratadine or cetirizine are both suitable first-line antihistamines in pregnancy at standard doses, with neither being preferred over the other. Intranasal corticosteroid sprays — including beclometasone, budesonide, and fluticasone — may be used at standard therapeutic doses for allergic rhinitis when antihistamines alone are insufficient, as systemic absorption is minimal at these doses.

The MHRA's drug safety guidance provides updated information on specific medicines and their use in pregnancy. The electronic Medicines Compendium (emc) contains detailed Summary of Product Characteristics (SmPC) documents for individual medications, which set out the available safety data. Pregnant women and healthcare professionals can also access UKTIS (uktis.org), which provides evidence-based information on the risks of medicine exposure during pregnancy, including monographs on antihistamines, decongestants, and intranasal corticosteroids.

The NICE CKS topics on allergic rhinitis, urticaria, and asthma provide primary care-aligned recommendations and referral thresholds relevant to pregnant women. The BSACI publishes specialist guidance on allergen immunotherapy, including its use — and contraindications — during pregnancy.

The overarching message from UK guidance is clear: allergy symptoms in pregnancy should not be dismissed, but treatment decisions must be made carefully, with preference given to non-pharmacological measures, followed by medications with the most established safety profiles. Regular review by a GP or specialist ensures that management remains appropriate as the pregnancy progresses. If you or a healthcare professional suspects a side effect from any medicine used during pregnancy, this should be reported to the MHRA via the Yellow Card scheme (search 'MHRA Yellow Card' online).

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