Quinfamide

Abstract: The present study was carried out to evaluate the effectiveness of nitazoxanide compared with that of quinfamide, mebendazole, or both in the treatment of intestinal protozoa and helminthic infections. A total of 677 stool specimens from children aged 2-12 years living in 3 communities of Colima, Mexico, were analyzed in order to detect the presence of cysts, trophozoites, eggs, or larvae of intestinal protozoa or helminths. A total of 275 infected children were enlisted in a double-blind controlled study and randomly assigned to one of 2 treatment groups: Group A, nitazoxanide (200 mg for 3 days) and Group B, quinfamide (100 mg for 1 day), mebendazole (200 mg for 3 days), or both. A posttreatment fecal examination was conducted on Day 14 from treatment initiation. In Group A (n = 143), the parasitosis eradication rate was superior to that of Group B (n = 132). However, there was no significant difference between the 2 groups (P > 0.05).

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Abstract: A novel tetrahydroquinolinyl ester, quinfamide, administered orally in multiple doses for 3 days had an ED50 of 0.25 mg/kg/day (total dose 0.75 mg/kg) for eradicating Entamoeba criceti in hamsters in several tests. It was significantly more active by direct comparison than 3 commercially available amoebicides and at least as active as 2 other esters of the parent compound, 1-(dichloroacety)-1,2,3,4-tetrahydro-6-quinolinol. After administration of a single dose, ED50 calculations for quinfamide averaged 0.9 mg/kg. Quinfamide was considerably more active than the other tetrahydroquinolinols, diloxanide furoate and teclozan, and it was approximately 1.5 times more active than etofamide; a statistical significance between the latter 2 drugs could be demonstrated in one of 4 tests. Administered prophylactically, quinfamide was shown to protect hamsters from re-infection with E. criceti. It also inhibited propagation of E. histolytica in vitro at a concentration of 20 microgram/ml. No adverse effects were noted in rodents after a single dose as high as 10 g/kg. Daily administration to monkeys of doses up to 500 mg/kg for as long as 37 days produced no pharmacological aberrations during or after medication; haematological studies and urine analyses were normal and no gross or microscopical tissue changes attributable to quinfamide were observed. No toxicity was revealed following acute (2 g/kg) and chronic (500 mg/kg/day x 31 days) administration of the drug to dogs and rats, respectively.

Abstract: Objective: To compare the efficacy and safety of single doses of quinfamide and secnidazole in the treatment of amoebic non-dysenteric colitis in children.