The usual adult dosage of Cetirizine is 10mg once a day.

However, the exact dosage can change depending on your age or the medication you’re taking.

Always read the patient information leaflet contained with your medication thoroughly or follow your doctor or pharmacist’s advice so you know that you’re taking the correct dosage.

Cetirizine is a newer formula of antihistamine, and usually won’t make you feel drowsy or sleepy.

However, drowsiness is a known side effect of Cetirizine, so if you experience this you should not attempt to drive or operate tools or machinery until you are absolutely sure that you are safe to do so.

Currently, alcohol is not known to have an effect of medicines containing Cetirizine, as long as the amount you drink is low (around the equivalent of one glass of wine) and your medicine is taken at the recommended doses.

However, Cetirizine is an antihistamine, and it is recommended that you should not drink alcohol while taking any antihistamine, including Cetirizine based products.

Like all medications, Cetirizine can have side effects, although not everyone will experience them.

Some of the most common side effects include:

• Drowsiness, sleepiness
• Dizziness
• Headaches
• Dry mouth
• Nausea
• Diarrhoea
• Sore throat
• Swelling and irritation inside the nose

If you experience these or any other side effects while using cetirizine, stop use and speak to your doctor or pharmacist immediately, if necessary.

Make sure you read the patient information leaflet of your own medication thoroughly for a full list of side effects.

You should speak to your doctor or pharmacist before taking medicines containing Cetirizine if you are pregnant or breastfeeding.

This may not be the best medicine for you or your baby at this time, and a medical professional may wish to recommend a product that’s safer or more appropriate for you.

Honestly there isn’t much difference between these ingredients, so if you see them written on your medication, don’t worry.

Hydrochloride and Dihydrochloride are types of salts that are used to help your medicine dissolve in your stomach, and don’t interfere with the active ingredient.

This means that if you see that your medicine contains Cetirizine, Cetirizine Hydrochloride, or Cetirizine Dihydrochloride, you’ll still be getting the same active ingredient with the same level of effectiveness when treating your allergy symptoms.