In fact, most over-the-counter sleep aids contain antihistamines.
These products are intended to be used for only two to three nights at a time, however, such as when stress, travel or other disruptions keep you awake.
The brands include: The first-generation antihistamine diphenhydramine is the main active ingredient in Benadryl.
Benadryl relieves runny nose, sneezing, itchy, watery eyes, and nose or throat itching.
Tolerance to the sedative effects of antihistamines can develop quickly.
As a result, the longer you take them, the less likely they are to make you sleepy.
Non-drowsy antihistamines are generally the best option, as they're less likely to make you feel sleepy.
But types that make you feel sleepy may be better if your symptoms affect your sleep.
The first generation antihistamines are the older group of antihistamines and are often used as ‘sleeping aids’ because of its strong sedative actions.
Antihistamines are medicines often used to relieve symptoms of allergies, such as hay fever, hives, conjunctivitis and reactions to insect bites or stings.