Metaraminol (also known as metaradrine), a stereoisomer of meta-hydroxynorephedrine (3,β-dihydroxyamphetamine), is a potent sympathomimetic amine used in the prevention and treatment of hypotension, particularly as a complication of anesthesia. It is an α1-adrenergic receptor agonist with some β effect. Metaraminol is also used in the treatment of priapism. Although not approved for this use, it appears to be effective.
| Molecular Weight | 317.29 |
| Formula | C9H13NO2.C4H6O6 |
| CAS Number | 33402-03-8 |
| 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.
[3] Kenneth Anderson, et al. BET 3: Peripheral metaraminol infusion in the emergency department
[4] W J TAYLOR, et al. The use of metaraminol bitartrate to reduce the side effects of atropine
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