Antihistamine

Responsible for a wide variety of allergic symptoms rich as puritis, rhinorrhea and watery eyes 

Hydroxyzine is a potent inverse agonist of histamine H1 receptor. They not only block the completely stop activity of lutamine receptors 

Inverse agonism increase the hydroxyzine deficiency

Antipruritic, Antihistamines

Flea allergy dermatitis

Dog- Antipruritic/flea allergy- 2.2mg/kg 

Cats- Antipruritic - 1-2mg/kg

Horse- 0.5- 1mg/kg BID

Birds- Allergies- 1 to 2 mg in 120 ml water /2mg/kg TID

Dry mouth, decrease GI secretion

Some teratogenic effects

Tablet Atarax 10mg, 25 mg

Atarax syrup 100ml (10mg/50ml) 

Atarax drop 15ml(6mg/ml) 

Injection Atarax 2ml (25mg/ml)