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