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These symptoms may be due to hay fever, other upper respiratory allergies, or the common cold.Benadryl can also be used to treat hives and to reduce redness and itching.
If you have an enlarged prostate that makes it difficult for you to urinate, you should talk to your doctor before using first-generation antihistamines. You should also talk to your doctor before using these drugs if you have any of these health concerns: If you take other drugs that can make you drowsy, such as sedatives or tranquilizers, talk to your doctor before using first-generation antihistamines.
When you have an allergic reaction, your body releases a substance called histamine.
Histamine causes allergy symptoms when it binds to receptors on certain cells in your body.
That means you can control your symptoms with only 1 or 2 doses each day compared with older medications, which usually require doses every 4 to 6 hours to maintain their effectiveness.
The newer antihistamines are available only by prescription.
Antihistamines work by decreasing the effects of histamine at certain cell receptors.
Over-the-counter (OTC) antihistamines can help treat symptoms such as: First-generation OTC oral antihistamines, including diphenhydramine and chlorpheniramine, are the oldest group.You should also avoid drinking alcohol with any antihistamine because it can increase the side effect of drowsiness.The newer second-generation and third-generation OTC oral antihistamines were developed to target their action on more specific receptors.Cetirizine is the main active ingredient in Zyrtec.It helps relieve runny nose, sneezing, itchy and watery eyes, and nose or throat itching from hay fever and other upper respiratory allergies.First-generation brands include Benadryl and Chlor-Trimeton. The first-generation antihistamine diphenhydramine is the main active ingredient in Benadryl.