Widely used as an antihistamine, it helps relieve allergy symptoms such as sneezing, runny nose, itching, and watery eyes. It is also effective in treating motion sickness and short-term insomnia due to its sedative effects. Commonly found in over-the-counter sleep aids, it promotes drowsiness and helps people fall asleep faster. Additionally, it can be used to manage mild cases of Parkinson’s symptoms and reduce coughing when included in certain cold medications. Its ability to cross the blood-brain barrier contributes to both its therapeutic and sedating properties.