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The main discussion of these abbreviations in the context of drug prescriptions and other medical prescriptions is at List of abbreviations used in medical prescriptions. Some of these abbreviations are best not used, as marked and explained here.
Histidine (symbol His or H) [2] is an essential amino acid that is used in the biosynthesis of proteins.It contains an α-amino group (which is in the protonated –NH 3 + form under biological conditions), a carboxylic acid group (which is in the deprotonated –COO − form under biological conditions), and an imidazole side chain (which is partially protonated), classifying it as a ...
Consultation of a medical professional is recommended for those who intend to take antihistamines for longer-term use. [ 1 ] Although the general public typically uses the word "antihistamine" to describe drugs for treating allergies, physicians and scientists use the term to describe a class of drug that opposes the activity of histamine ...
Clemastine is an antihistamine with anticholinergic and sedative effects. Antihistamines competitively bind to histamine receptor sites, thus reducing the neurotransmitter's effects. [9]
Meclizine was patented in 1951 and came into medical use in 1953. [5] It is available as a generic medication and often over the counter . [ 3 ] [ 6 ] In 2022, it was the 129th most commonly prescribed medication in the United States, with more than 4 million prescriptions.
Nizatidine was developed by Eli Lilly, and was first marketed in 1988. [3] It is considered to be equipotent with ranitidine and differs by the substitution of a thiazole ring in place of the furan ring in ranitidine.
This is thanks to an enzyme called phosphodiesterase type 5 (PDE5). ... regular long-term use of sildenafil was shown to improve left ventricle function while strengthening the structure of a ...
H 1 antagonists, also called H 1 blockers, are a class of medications that block the action of histamine at the H 1 receptor, helping to relieve allergic reactions.Agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines; other agents may have antihistaminergic action but are not true antihistamines.