Description: Cetrizine is an antihistamine drug that relieves the symptoms of allergies and hay fever. It works by blocking the effects of histamines, which cause allergic reactions. Phenylephrine is a decongestant that reduces swelling in the nasal passages. It works by constricting the tiny blood vessels that carry blood away from the sinuses, causing them to shrink.Paracetamol is an analgesic and antipyretics that helps reduce fever and pain. It works by reducing the amount of prostaglandins released in the body. Prostaglandins are chemicals that help increase sensitivity to pain.