Diphenhydramine Hydrochloride as the name suggests is the hydrochloride salt form of
diphenhydramine. It is a first-generation histamine antagonist and an ethanolamine with anti-
allergic activity. Diphenhydramine Hydrochloride relieves symptoms of red, irritated, itchy,
watery eyes, sneezing, runny nose caused by hay fever, allergies, or the common cold and
cough caused by airway irritation. It has antiemetic, antitussive, hypnotic, and antiparkinson
properties. When used to cure allergies, its receptors exist both peripherally and in the CNS
and can sedate as an antagonist of histamine H1 receptors in the CNS. Due to its sedative
effect, it is not the first choice of medicine for curing allergies. However, it has been used in
many non-prescription OTC sleep medicines and cough-and-cold medications sold for
nighttime use.
Diphenhydramine Hydrochloride is sold under the brand names like Allerdryl, Benadryl,
Benhydramin and Benylin to name a few.
George Rieveschl, a former professor at the University of Cincinnati discovered it in 1943. It
has the distinction of being the first prescription antihistamine approved by the U.S. FDA In
1946. Further research in the 1960s revealed that its effective in inhibiting the reuptake of
neurotransmitter serotonin.
Dosage and administration
Diphenhydramine Hydrochloride is sold as tablets and capsules. The recommended dose for
adults and children older than 12 years is 25 mg to 50 mg or 1 to 2 capsules. The pediatric
dose for children aged 6 to 12 years, is 12.5 mg. and parents should consult for dose in kids
younger than 6 years.
The cost of Diphenhydramine Hydrochloride
In the USA, the consumers pay an average retail price of $5 for a generic 30 capsules of
25mg. However, this medicine is significantly cheaper in the developing world. In India, for 20
capsules, the consumers pay an average retail price of USD0.40 or 40 cents.
How does Diphenhydramine Hydrochloride Work?
Diphenhydramine hydrochloride competitively blocks H1receptors. This results in the prevention
of histamine actions on bronchial smooth muscle, capillaries, and gastrointestinal smooth
muscle. This achieves the desired reduction in histamine-induced bronchoconstriction,
vasodilation, increased capillary permeability, and GI smooth muscle spasms.
Diphenhydramine hydrochloride has antitussive, hypnotic, antiemetic, and antiparkinson
actions. In its actions in curing allergies, its receptors exist both peripherally and in the CNS
and can sedate as an antagonist of histamine H1 receptors in the CNS. Due to its sedative
effect, it is not the first choice of medicine for curing allergies.
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