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Diphenhydramine, sold under the brand name Benadryl among others, is an antihistamine and sedative. It is a first-generation H 1 -antihistamine and it works by blocking certain effects of histamine , which produces its antihistamine and sedative effects.
For example, diphenhydramine is sold under the brand name Benadryl as an antihistamine for use against allergies. [11] Tylenol PM contains diphenhydramine in addition to acetaminophen for the purpose of inducing sleep and reducing pain and/or fever. [12]
Contains 250 mg acetaminophen, 250 mg aspirin and 65 mg caffeine. 1969: Excedrin PM – Excedrin PM is the first headache and sleeping pill combination product. [8] Contains 500 mg acetaminophen and 38 mg diphenhydramine citrate as a sleep aid. Those same active ingredients were later utilized several years later in the product Tylenol PM.
Some over-the-counter antihistamines, like Benadryl, contain diphenhydramine, an ingredient that can make people feel sleepy. Doxylamine, an ingredient in some antihistamine and insomnia ...
Benadryl can also be found in a topical form including gels and creams. Benadryl Itch Stopping Cream is a topical cream used to provide temporary itch relief for allergies, hives or even some insect bites. It can be found in the United States and Canada. This topical medication contains 2% of diphenhydramine hydrochloride and 1% of zinc acetate.
Diphenhydramine (Benadryl) was synthesized in 1943, tripelennamine (Pyribenzamine) was patented in 1946, and promethazine (Phenergan) was synthesized in 1947 and launched in 1949. [22] [23] [24] By 1950, at least 20 antihistamines had been marketed. [25]
NyQuil D contains pseudoephedrine, a decongestant that in some regions (such as the United States) is now placed behind the counters at pharmacy and other retail stores and must be requested by the customer. It contains the following active ingredients (15 mL is one tablespoon, half the recommended adult dose):
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related to: does diphenhydramine contain aspirin