Atarax 25 mg is a medication used to treat itching, anxiety, tension, and other symptoms related to allergies, agitation, or nervousness. It is a sedative/hypnotic medication, so it can help people with insomnia. This medication comes in the form of 25 mg tablets, usually taken by mouth up to 3 times a day depending on the severity of symptoms. It is important to take Atarax 25 mg as prescribed, and do not take larger doses than prescribed or change your dose without medical advice. Possible side effects include drowsiness, confusion, dizziness, dry mouth, stomach pain, and constipation.