Cetirizine + Paracetamol + Phenylephrine is a combination of three medicines, which relieves common cold symptoms. Cetirizine is an antiallergic . It blocks histamine which is a chemical messenger to relieve allergy symptoms like runny nose, watery eyes and sneezing. Paracetamol is an analgesic i.e. a pain reliever and antipyretic i.e. a fever reducer. It blocks the release of certain chemical messengers in the brain that are responsible for pain and fever. Phenylephrine is a decongestant. It narrows the small blood vessels providing relief from congestion or stuffiness in the nose.