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Diphenhydramine is a first-generation antihistamine used to treat several conditions including allergic symptoms and itchiness, the common cold, insomnia, motion sickness, and extrapyramidal symptoms. [19] [20] Diphenhydramine also has local anesthetic properties, and has been used as such in people allergic to common local anesthetics such as ...
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]
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Dimenhydrinate is a theoclate salt composed of diphenhydramine and 8-chlorotheophylline (a theophylline relative) in a 1:1 ratio. [ 2 ] Dimenhydrinate was introduced to the market by G.D. Searle in 1949.
The altered state of consciousness produced by common or 'classical' deliriant substances such as scopolamine, atropine and diphenhydramine is mediated through the drug compounds' competitive antagonism of the peripheral and central muscarinic acetylcholine receptors, especially the M 1 muscarinic receptor.
Pheniramine (trade name Avil among others) is an antihistamine with anticholinergic properties used to treat allergic conditions such as hay fever or urticaria.It has relatively strong sedative effects, and may sometimes be used off-label as an over-the-counter sleeping pill in a similar manner to other sedating antihistamines such as diphenhydramine.
In 1943, one of his students, Fred Huber, synthesized diphenhydramine. Rieveschl worked with Parke-Davis to test the compound, and the company licensed the patent from him. In 1947 Parke-Davis hired him as their director of research. While he was there, he led the development of a similar drug, orphenadrine. [5]