Cyproheptadine

Concurrent use may potentiate the CNS depressant effects of either these medications /alcohol or other CNS depression-producing medications/ or antihistamines; also, concurrent use of maprotiline or tricyclic antidepressants may potentiate the anticholinergic effects of either antihistamines or these medications. /Antihistamines/

Anticholinergic effects may be potentiated when these medications /anticholinergics or other medications with anticholinergic activity/ are used concurrently with antihistamines; patients should be advised to report occurrence of gastrointestinal problems promptly since paralytic ileus may occur with concurrent therapy. /Antihistamines/

Concurrent use of monoamine oxidase (MAO) inhibitors with antihistamines may prolong the intensify the anticholinergic and CNS depressant effects of antihistamines; concurrent use is not recommended. /Antihistamines/

Concurrent use /of ototoxic medications/ with antihistamines may mask the symptoms of ototoxicity such as tinnitus, dizziness, or vertigo. /Antihistamines/

For more Interactions (Complete) data for CYPROHEPTADINE (12 total), please visit the HSDB record page.

Unlike most first generation antihistamines, cyproheptadine has been associated with several instances of clinically apparent liver injury. The few cases that have been described had a time to onset of 1 to 6 weeks and a cholestatic or mixed pattern of liver enzyme elevations. Immunoallergic and autoimmune features were not present and most patients recovered rapidly without residual. Acute liver failure due to cyproheptadine has not been described.

Cyproheptadine competes with free histamine for binding at HA-receptor sites. This antagonizes the effects of histamine on HA-receptors, leading to a reduction of the negative symptoms brought on by histamine HA-receptor binding. Cyproheptadine also competes with serotonin at receptor sites in smooth muscle in the intestines and other locations. Antagonism of serotonin on the appetite center of the hypothalamus may account for Cyproheptadine's ability to stimulate appetite.

Drug-Induced Liver Injury Severity and Toxicity (DILIst)

cyproheptadine

DILI Positive

Oral

DOI:10.1016/j.drudis.2019.09.022

In experiments on chick embryos from various age groups, studies have been made of the effect of a blockader of serotonin receptors: cyproheptadine, and blockader of adrenoreceptors: propranolol, on rhythmic activity of the amnion in vivo after injection of the substances into amniotic fluid. Stimulating effect of propranolol from the 9th to the 19th day of incubation and inhibitory effect of cyproheptadine from the 5th to the 19th day of incubation were revealed. These results indicate the existence of serotonin and noradrenaline in the amniotic fluid of chick embryo. High performance liquid chromatography directly confirmed this conclusion.

CYPROHEPTADINE, THE MAIN CONSTITUENT OF THE APPETITE STIMULANT TONIC, MAGNADYN IS A POTENT ANTIHISTAMINE DRUG USED IN THE TREATMENT OF RHINITIS, PRURITUS, URTICARIA, NELSON S SYNDROME & CUSHING S SYNDROME. ITS GENOTOXIC EFFECT WAS INVESTIGATED ON SWISS ALBINO MOUSE BONE MARROW AND PERIPHERAL BLOOD CELLS THROUGH MICRONUCLEUS ANALYSIS. THE TONIC WAS ADMINISTERED ORALLY IN THREE DIFFERENT DOSES VIZ: 0.1 MG/KG, 0.5 MG/KG AND 2.5 MG/KG OF CYPROHEPTADINE IN 0.15 ML QUANTITY. THE THERAPEUTIC DOSE OF 0.5 MG/KG WAS ADMINISTERED DAILY FOR 45 DAYS. ADEQUATE NEGATIVE AND CYCLOPHOSPHAMIDE (50 MG/KG) TREATED POSITIVE CONTROLS WERE MAINTAINED. THE ANIMALS WERE SACRIFICED AT 24, 48 AND 72 HOURS OF ADMINISTRATION TO ASCERTAIN THE DOSE AND TIME-YIELD EFFECT OF THE DRUG. THE DATA WERE SUBJECTED TO MANN-WHITNEY U-TEST. THE EFFECT OF THE DRUG ON MICRONUCLEUS INDUCTION WAS NOT STATISTICALLY SIGNIFICANT IN BOTH THE TESTS. THERE WAS NO SIGNIFICANT CHANGE IN THE P/N RATIO. THE INCIDENCE OF MICRONUCLEUS IN PCE & NCE OF BOTH THE BONE MARROW AND PERIPHERAL BLOOD CELLS OF THE TREATED ANIMALS WERE STATISTICALLY NONSIGNIFICANT COMPARED TO NEGATIVE CONTROL EVEN AFTER LONG TERM ADMINISTRATION. THE ABOVE STUDY CLEARLY SHOWED THAT CYPROHEPTADINE IS NEITHER CLASTOGENIC NOR MITOCLASTIC IN THE PRESENT TEST SYSTEM.

The clonal insulin producing cell line RINm5F was evaluated as model for the action of cyproheptadine (CPH)-like diabetogenic compounds in the rat pancreas. Treatment with 10 ug CPH and selected structural analogs under culture conditions produced a progressive loss of cellular insulin which reached 30% of control within 24 hours. Comparison of the activities of the analogs 4-diphenylmethylpiperidine (4-DPMP) and 2-diphenylmethylpiperidine (2-DPMP) to produce cellular insulin depletion showed that 4-DPMP was as active as CPH but 2-DPMP had no activity at the highest concn employed (10 microM). The CPH metabolite desmethyl CPH-epoxide was five times more active than the parent compound in producing loss of insulin in RINm5F cells. These results are consistent with previously published results of CPH actions in vivo. An inhibition of insulin biosynthesis with no loss of preproinsulin mRNA occurred in RINm5F cells treated with CPH or DMCPH-epoxide. This suggests that an effect on transcription may not be the primary action by which CPH and its analogs inhibit insulin synthesis in vivo.

For treatment of overdose: Since there is no specific antidote for overdose with antihistamines, treatment is symptomatic and supportive with possible utilization of the following: Induction of emesis (syrup of ipecac recommended); however, precaution against aspiration is necessary, especially in infants and children. Gastric lavage (isotonic or 0.45% sodium chloride solution) if patient is unable to vomit within 3 hours of ingestion. Saline cathartics (milk of magnesia) are sometimes used. Vasopressors to treat hypotension; however, epinephrine should not be used since it may further lower blood pressure. Oxygen and intravenous fluids. Precaution against use of stimulants (analeptic agents) because they may cause seizures. /Antihistamines/

Agents, usually topical, that relieve itching (pruritus).

Drugs used for their effects on the gastrointestinal system, as to control gastric acidity, regulate gastrointestinal motility and water flow, and improve digestion.

Drugs that selectively bind to but do not activate histamine H1 receptors, thereby blocking the actions of endogenous histamine. Included here are the classical antihistaminics that antagonize or prevent the action of histamine mainly in immediate hypersensitivity. They act in the bronchi, capillaries, and some other smooth muscles, and are used to prevent or allay motion sickness, seasonal rhinitis, and allergic dermatitis and to induce somnolence. The effects of blocking central nervous system H1 receptors are not as well understood.

Drugs that bind to but do not activate serotonin receptors, thereby blocking the actions of serotonin or SEROTONIN RECEPTOR AGONISTS.

Agents that are used to treat allergic reactions. Most of these drugs act by preventing the release of inflammatory mediators or inhibiting the actions of released mediators on their target cells. (From AMA Drug Evaluations Annual, 1994, p475)

A single study examining the difference in absorption of orally administered versus sublingually administered cyproheptadine in five healthy males demonstrated a mean Cmax of 30.0 mcg/L and 4.0 mcg/L, respectively, and a mean AUC of 209 mcg.h/L and 25 mcg.h/L, respectively. The Tmax of orally and sublingually administered cyproheptadine was 4 hours and 9.6 hours, respectively.

Approximately 2-20% of the radioactivity from an orally administered radio-labeled dose of cyproheptadine is excreted in the feces, of which approximately 34% is unchanged parent drug (less than 5.7% of the total dose). At least 40% of radioactivity is recovered in the urine.

H1 antagonists are eliminated more rapidly by children than by adults and more slowly in those with severe liver disease. /H1 Receptor Antagonists/

The H1 antagonists are well absorbed from the gastrointestinal tract. Following oral administration, peak plasma concentrations are achieved in 2 to 3 hours ... . /H1 Receptor Antagonists/

To investigate the pharmacokinetics of cyproheptadine (CPH) and its metabolites, the plasma concn and urinary excretion of CPH and its detectable metabolites were determined after iv admin of parent or synthesized metabolites to rats. The plasma CPH concn time course was subjected to biexponential calculation following the iv admin of CPH, producing the temporal and low plasma concn of desmethylcyproheptadine (DMCPH) and the sustained plasma concn of desmethylcyproheptadine epoxide (DMCPHepo). DMCPH was also eliminated according to the biexponential equation, after iv admin of performed DMCPH, forming DMCPHepo in plasma. On the other hand, no detectable DMCPHepo was found in plasma after the iv admin of cyproheptadine epoxide (CPHepo). All cmpd administered had large distribution volumes and were most entirely excreted as DMCPHepo in urine; this excretion continued for a long time. However, the urinary excretion pattern of DMCPHepo after CPHepo was different from those after CPH and MCPH. The mean residence times of the epoxidized metabolites estimated from the urinary data were much longer than those from the plasma concn data, suggesting either a gradual reflux of the metabolites from a tissue depot into systemic circulation under those plasma concn close of detection limit, or one interaction which delays excretion into the urine. This study suggests that both metabolic pathways of CPH, through DMCPH nd CPHepo, to DMCPHepo are possible, but that the demethylation largely occurs prior to epoxidation; also that the extensive and persistent distribution of DMCPHepo to tissues may relate to the toxicity of CPH reported in rats.

Twelve diphenhydramine and cyproheptadine derivatives were synthesized and screened for Hl-receptor antagonist activity at the isolated guinea pig ileum and for H2-receptor antagonist activity at the isolated guinea pig right atrium. The cmpd showed high Hl- and H2-receptor antagonist activity. The incorporation of the diphenhydramine and cyproheptadine components provided high affinity to Hl-receptors. All compounds elicited a dual mode of competitive and noncompetitive antagonism. The nitroethenediamines with 4-fluoro-4-methyl-substituted diphenhydramine as the Hl-receptor antagonist moiety displayed the most potent Hl- and H2-receptor antagonist effects.