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Niclosamide, a widely used anthelmintic drug in underdeveloped countries, is known to be mutagenic in the Salmonella typhimurium microsomal test system. The urine obtained from mice treated with niclosamide is mutagenic in the TA98 and TA1538 strains. Its effects on mouse-sperm morphology were evaluated in CD₁ and (BALB/cJ × DBA/2J) F₁ mice after 5 daily oral niclosamide doses of either 60, 80, 100 or 120 mg/kg. A statistically significant increase in abnormal sperm morphology was detected in both CD₁ and (BALB/cJ × DBA/2J) F₁ mice. No drug-related effects on testis weight nor on sperm count were observed in either genotype.

Urine samples obtained from niclosamide-treated F₁ mice were assayed with the Salmonella typhimurium strain TA1538 both in the absence and presence of β-glucuronidase. In the absence of glucuronidase, urine mutagenicity increased with increasing dose and the highest …