Cetirizine for allergies

Overview

Cetirizine is a type of antihistamine that is used to relieve symptoms of allergies such as hay fever or urticaria (hives).

It is available on prescription from a doctor or dentist, or to buy without a prescription from pharmacies and other shops.

Cetirizine comes as tablets, capsules, and liquid medicine. Liquid formulations are usually suitable for younger children, although cetirizine is not recommended for children under 2 years old.

Cetirizine works by blocking the effects of histamine - a chemical that is released when your body is exposed to substances such as pollen, pet fur, house dust, detergents, or insect bites.

Histamine causes allergy symptoms such as sneezing, itching, watery eyes, skin rashes, and a runny nose. By blocking histamine, cetirizine helps relieve these symptoms.

Common side effects of cetirizine include:

• Feeling tired or sleepy.

• Dizziness.

• Dry mouth.

• Headache.

• Feeling sick (nausea).

• Stomach pain.

Children may also experience additional side effects such as:

• Diarrhoea.

• Sore throat.

• Nose irritation.

A full list of the side effects which can be associated with your medicine can be found in the manufacturer's printed information leaflet supplied with the medicine.

If you experience any other symptoms which you think may be due to cetirizine, speak with your doctor or pharmacist for further advice.

To make sure that this is the right treatment for you (or your child), before you (or they) start taking cetirizine it is important that you discuss the treatment with a doctor or pharmacist if:

• You are pregnant, trying for a baby or breastfeeding.

• You/they have any kidney problems. If so, the recommended dose will be reduced.

• You/they have epilepsy.

• You/they have a rare inherited blood disorder called porphyria.

• You/they are taking or using any other medicines. This includes any medicines being taken which are available to buy without a prescription, as well as herbal and complementary medicines.

• You/they have ever had an allergic reaction to another antihistamine, or to any other medicine.
  

• Read the leaflet in your medicine pack before starting treatment.

• Take cetirizine exactly as directed on the label or by your doctor or pharmacist.

• Recommended doses of cetirizine are:

  • For adults and for children aged over 12 years: 10 mg taken once a day.

  • For children aged 6-11 years: 5 mg taken twice daily.

  • For children aged 2-5 years: 2.5 mg taken twice daily.

• If using liquid medicine for a child, measure doses carefully using the bottle instructions.

• Cetirizine can be taken with or without food. Swallow tablets with water if needed.

• If you miss a dose, take the next one when due. Do not take two doses at the same time.
  

• Most people only need cetirizine for a short time. Stop taking it once your symptoms improve.

• Although it is a “non-drowsy” antihistamine, it can still cause sleepiness in some people. If this happens, do not drive, cycle, or use tools or machinery.

• Be careful with alcohol, as it can increase drowsiness and side effects.

• Tell your doctor or healthcare provider you are taking cetirizine before any surgery, medical treatment, or allergy tests.

• Check with a pharmacist before taking other medicines, as some can increase side effects when combined with cetirizine.
  

• Keep all medicines out of the reach and sight of children.

• Store in a cool, dry place, away from direct heat and light.
  

How long does cetirizine take to work?

Cetirizine usually starts working within 30–60 minutes. It can help relieve allergy symptoms such as sneezing, itching, and watery eyes fairly quickly, with full effect within a few hours.

How long does cetirizine last?

A single dose of cetirizine usually lasts around 24 hours. This is why it is typically taken once daily for ongoing allergy relief.

Can you take cetirizine every day?

Yes, cetirizine can be taken daily if needed for allergies. However, it is usually used for short-term symptom relief. Speak to a doctor or pharmacist if you need it for long periods.

Can cetirizine make you sleepy?

Yes, although it is classed as a non-drowsy antihistamine, cetirizine can still cause drowsiness in some people. If this happens, avoid driving or using machinery.

Can you take cetirizine with alcohol?

It’s best to avoid or limit alcohol while taking cetirizine. Alcohol can increase drowsiness and make side effects like dizziness more likely.

Can you take cetirizine while pregnant?

Cetirizine can sometimes be used in pregnancy, but only if advised by a doctor. Always check with a healthcare professional before taking it.