According to Drugs.com, cetirizine is an antihistamine. It is used in the treatment of common cold or allergy symptoms, such as watery eyes, runny nose, itching or sneezing. Cetirizine may also be used in the treatment of symptoms from hives, such as itching and swelling.
Cetirizine may produce side effects that negatively affect thinking or reactions, states Drugs.com. Consuming alcohol should be avoided while taking this medication, as it may exacerbate side effects. Older adults may have to take a dose considered lower than normal. Overdose symptoms may include feelings of restlessness or nervousness, followed by drowsiness. Cetirizine is not expected to cause harm to an unborn baby when taken during pregnancy. However, this medication can pass into breast milk, potentially being harmful to a nursing baby.