Phenylephrine is in a class of medications called nasal decongestants. Phenylephrine is used to relieve nasal discomfort caused by colds, allergies, and hay fever. It is also used to relieve sinus congestion and pressure. It works by reducing swelling of the blood vessels in the nasal passages. Paracetamol is a non-opioid analgesic and antipyretic agent used to treat fever and mild to moderate pain. Dextromethorphan is in a class of medications called antitussives. It works by decreasing activity in the part of the brain that causes coughing. Dextromethorphan is used to temporarily relieve cough caused by the common cold, the flu, or other conditions. Levocetirizine is a second-generation antihistamine that works by preventing the effects of a substance called histamine, which is produced by the body. Histamine can cause itching, sneezing, runny nose, and watery eyes. Levocetirizine is used for the treatment of allergic rhinitis (hay fever) and long-term hives of unclear cause. It is less sedating than older antihistamines.