What does cyproheptadine mean?
Cyproheptadine is a synthetic medication belonging to the class of first-generation antihistamines. It works primarily by blocking histamine H1 receptors, which makes it effective against allergic symptoms such as sneezing, itching, hives, and hay fever. Unusually for an antihistamine, it also blocks serotonin receptors, a property that gives it a second clinical life: because increased appetite and drowsiness are among its known effects, doctors and veterinarians often prescribe it deliberately to stimulate weight gain in patients who need to eat more, including children with poor appetites and animals such as cats. Sold originally under the brand name Periactin, cyproheptadine is available as tablets and syrup, typically in its hydrochloride form. Although drowsiness limits its use compared with newer non-sedating antihistamines, its dual action and appetite-boosting effect have kept it in steady use in both human and veterinary medicine since its introduction in the mid-twentieth century.
nounA synthetic antihistamine drug that blocks histamine H1 receptors and also acts as a serotonin antagonist, used chiefly to treat allergic conditions and to stimulate appetite.
- A first-generation antihistamine (H1 receptor antagonist) with additional serotonin-blocking activity, used to treat allergies, itching, and hay fever, and prescribed off-label as an appetite stimulant.
"The veterinarian prescribed cyproheptadine to coax the finicky cat back to its food bowl."
"After the antihistamines she had tried failed to relieve her chronic hives, her doctor switched her to cyproheptadine."
"Cyproheptadine is sometimes given to underweight patients because one of its well-known side effects is increased appetite."
Rarely pluralized; the word normally refers to the drug substance generically, so plural forms appear only in contexts discussing multiple formulations or analogues.
"The formulary stocked several cyproheptadines alongside related antihistamines."
This allergy pill has a famous side effect doctors sometimes prescribe on purpose: it makes you hungry.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cyproheptadine
The name cyproheptadine was coined as a systematic-style pharmaceutical name reflecting the drug's chemical architecture, combining reference to a substituted piperidine structure with a cycloheptadiene ring system in its molecular skeleton. It follows the pattern of many mid-twentieth-century drug names that encode structural features directly into the word. The term entered English medical vocabulary when the compound was developed and marketed as an antihistamine in the 1960s.
How cyproheptadine is actually used
A technical pharmaceutical term encountered mainly in medical, veterinary, and pharmacological contexts rather than everyday speech; it is usually referred to by brand name in casual conversation.
Easily confused with cyproheptadine
Cyproheptadine is an antihistamine and appetite stimulant, whereas cyproterone is an antiandrogen hormone therapy used for different medical purposes entirely.