Fenbendazole (Panacur) is a broad spectrum benzimidazole anthelmintic used against gastrointestinal parasites with an IC5 of about 0.01 ug/ml. Drug interactions may occur if using bromsalan flukicides such as dibromsalan and tribromsalan. Abortions in cattle and death in sheep have been reported after using these medications together. In a study, the LC90s of albendazole and mebendazole were 0.92 to 2.1ug/ml, and those of fenbendazole were 0.06 to 0.07ug/ml; the latter are eight to ninefold lower than the LC90s of amphotericin B that were obtained. <
| Molecular Weight | 299.35 |
| Formula | C15H13N3O2S |
| CAS Number | 43210-67-9 |
| Form | Solid |
| Solubility (25°C) | DMSO |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
[5] Qiwen Duan, et al. Fenbendazole as a potential anticancer drug
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