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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.
Some forms of Benadryl are to be taken orally, while some creams and gels are to be applied to the skin. [2] Common side effects of the drug include drowsiness, dizziness, dry mouth and throat, confusion, and blurred vision. [2] In the United States and Canada, the active ingredient is diphenhydramine.
Piperoxan was discovered in 1933 and was the first compound with antihistamine effects to be identified. [22] Piperoxan and its analogues were too toxic to be used in humans. [22] Phenbenzamine (Antergan) was the first clinically useful antihistamine and was introduced for medical use in 1942. [22]
First-generation antihistamines include diphenhydramine (Benadryl), carbinoxamine (Clistin), clemastine (Tavist), chlorpheniramine (Chlor-Trimeton), and brompheniramine (Dimetane). However, a 1955 study of "antihistaminic drugs for colds," carried out by the U.S. Army Medical Corps, reported that "there was no significant difference in the ...
The recommended dosage of Benadryl tablets for adults is 1 to 2 tablets every 4 to 6 hours, [1] and only 1 tablet every 4 to 6 hours for children under the age of 12. [2]The Benadryl challenge is an internet challenge that emerged in 2020, revolving around the deliberate consumption, excessive use and overdose of the antihistamine medicine diphenhydramine (commonly sold in the United States ...
An equianalgesic chart is a conversion chart that lists equivalent doses of analgesics (drugs used to relieve pain). Equianalgesic charts are used for calculation of an equivalent dose (a dose which would offer an equal amount of analgesia) between different analgesics. [1]
The carcinogenicity of the drug in humans is not well-studied, and the International Agency for Research on Cancer lists the drug as "not classifiable as to its carcinogenicity to humans". [ 30 ] Continuous and/or cumulative use of anticholinergic medications, including first-generation antihistamines, is associated with a higher risk of ...
The FDA animal efficacy rule (also known as animal rule) applies to development and testing of drugs and biologicals to reduce or prevent serious or life-threatening conditions caused by exposure to lethal or permanently disabling toxic agents (chemical, biological, radiological, or nuclear substances), where human efficacy trials are not feasible or ethical. [1]