Cyproheptadine - How It Works
Clinical pharmacology details from the US FDA-approved label: how Cyproheptadine works in your body, how it's absorbed, how long it stays active, and how it's eliminated.
CLINICAL PHARMACOLOGY: Cyproheptadine HCI is a serotonin and histamine antagonist with anticholinergic and sedative effects.
Antiserotonin and antihistamine drugs appears to compete with serotonin and histamine, respectively, for receptor sites.
Pharmacokinetics and Metabolism: After a single 4 mg oral dose of 14C-labeled cyproheptadine HCl normal subjects given as tablets or syrup, 2-20% of the radioactivity was excreted in the stools.
Only about 34% of the stool radioactivity was unchanged drug, corresponding to less than 5.7% of the dose.
At least 40% of the administered radioactivity was excreted in the urine.
No significant difference in the mean urinary excretion exists between the tablet and syrup formulations.
No detectable amounts of unchanged drug were present in the urine of patients of chronic 12-20 mg daily doses of cyproheptadine syrup.
The principal metabolite found in human urine has been identified as a quaternary ammonium glucuronide conjugate of cyproheptadine.
Elimination is diminished in renal insufficiency.