Atrizin syrup is a brand name for a medication that contains the active ingredient cetirizine. It is an antihistamine used to treat symptoms associated with allergic reactions, such as hay fever, allergic rhinitis, and hives. It works by blocking the action of histamine, a substance produced by the body in response to allergens, which can cause inflammation and other symptoms. Atrizin syrup is available in various strengths and forms, including tablets, capsules, and oral solution. The syrup form is often preferred for children and people who have difficulty swallowing pills. The usual recommended dose of Atrizin syrup is based on the patient's age and weight. It is important to follow the instructions provided by the healthcare provider or as directed on the product label. Typically, the recommended doses are as follows: Children aged 6 months to 2 years: 2.5 mg (half a teaspoon) once a day Children aged 2 to 6 years: 2.5 mg (half a teaspoon) twice a day or 5 mg (one teaspoon) once a day Children over 6 years and adults: 5-10 mg (one to two teaspoons) once a day The medication can be taken with or without food, but it is recommended to take it with water or other fluids to help prevent dehydration. Atrizin syrup can cause side effects, although not everyone experiences them. Some common side effects include drowsiness, dry mouth, headache, nausea, and stomach upset. In rare cases, serious side effects such as difficulty breathing, hives, and swelling of the face, lips, tongue, or throat may occur. If you experience any of these serious side effects, seek immediate medical attention. It is important to talk to your healthcare provider before starting treatment with Atrizin syrup, especially if you have a history of liver or kidney problems, epilepsy, or other medical conditions, or are taking any other medications. Also, inform your healthcare provider if you are pregnant, breastfeeding, or planning to become pregnant.