Methylnaltrexone Bromide, a quaternary derivative of Naltrexone, is an orally active and selective mu-opioid receptor antagonist, functions as a peripherally acting receptor antagonist in tissues of the gastrointestinal tract. Methylnaltrexone Bromide has restricted ability to cross the blood-brain barrier.
| Molecular Weight | 436.34 |
| CAS Number | 73232-52-7 |
| Solubility (25°C) | DMSO ≥ 31 mg/mL |
| Storage | 2-8°C, protect from light |
| 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.
[1] No authors listed. Methylnaltrexone
[3] David Prichard, et al. Management of opioid-induced constipation
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