Losartan potassium is a selective non-peptide angiotensin AT1 receptor antagonist. Losartan potassium inhibits the contractile effects of angiotensin II on rabbit aorta and jugular vein (pA2 = 8.27). Losartan potassium is an angiotensin II receptor antagonist drug.
| Molecular Weight | 462.01 |
| Formula | C22H23ClKN6O |
| CAS Number | 124750-99-8 |
| Solubility (25°C) | DMSO 78 mg/mL Water 39 mg/mL |
| 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.
[2] Abdul-Rahman A Al-Majed, et al. Losartan: Comprehensive Profile
[3] Domenic A Sica, et al. Clinical pharmacokinetics of losartan
[4] L M Burrell. A risk-benefit assessment of losartan potassium in the treatment of hypertension
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