A cold with a runny nose, sneezing, and nasal congestion can be reduced by taking antihistamines or decongestants. Colds are caused by viral infections and can have symptoms such as a runny nose, sneezing, and nasal congestion. A runny nose as well as sneezing can be treated with antihistamines such as cetirizine. Cetirizine has anti-allergic properties and relieves the symptoms of sneezing. It also reduces the permeability of blood vessels and decreases the dilatation of small blood vessels, which leads to a reduction in runny nose. High-precision workers such as drivers and pilots are prohibited from taking the drug during work. Decongestive drugs such as pseudoephedrine hydrochloride can cause vasoconstriction of the nasal mucosa, reduce congestion caused by congestion, and restore ventilation to the nose. Pseudoephedrine hydrochloride should not be taken for too long, otherwise it will cause drug rhinitis. The medication should be taken according to the doctor’s prescription.