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Allergy medicines (antihistamines)

Hydroxyzine

Also sold as: Atarax

Prescription neededAllergy medicines (antihistamines)
Comes as:TabletSyrup

Usual adult dose

Usual adult dose for itching: 25 mg up to 3 times a day, often started at night. Do not take more than 100 mg a day (50 mg a day in elderly people).

Your doctor may give you a different dose. Children's doses depend on weight.

Side effects

Common

  • drowsiness
  • dry mouth
  • headache
  • tiredness

Serious — get help

Stop taking it and see a doctor straight away if you notice:

  • fast or irregular heartbeat or fainting (heart rhythm problem)
  • fits
  • severe skin rash with fever

Do not take it, or take care, if

  • Heart rhythm problems (long QT) or low potassium
  • Early pregnancy and breastfeeding
  • Glaucoma or difficulty passing urine
  • Do not drive or use machines if drowsy; avoid alcohol

Interactions

Medicines that can react with this one.

Serious2 medicinesDo not take these together unless your doctor says so.
  • Amiodarone

    Both prolong the QT interval; the combination should be avoided.

  • Citalopram

    Both prolong the QT interval and together raise the risk of dangerous heart rhythms.

Moderate1 medicineTake together only with care. Ask your doctor or pharmacist.
  • Diazepam

    Together they cause more drowsiness and slowed reactions.

Pregnancy

  1. A
  2. B
  3. C
  4. D
  5. X

Category C

A risk to the baby cannot be ruled out. Use only if your doctor says the benefit is greater than the risk.

Generic alternatives

Similar medicines your doctor or pharmacist may offer instead.

  • CetirizineNo prescription needed
  • ChlorphenamineNo prescription needed
  • Promethazine
Check with my other medicines

Always follow your doctor or pharmacistThis page is general information, not a prescription. Do not start, stop or change a medicine on your own.