Furosemide (Lasix) is a loop diuretic used in the treatment of congestive heart failure and edema. Furosemide acts by inhibiting the Na-K-2Cl symporter in the thick ascending limb of the loop of Henle. The action on the distal tubules is independent of any inhibitory effect on carbonic anhydrase or aldosterone; it also abolishes the corticomedullary osmotic gradient and blocks negative as well as positive free water clearance.
| Molecular Weight | 330.74 |
| Formula | C12H11ClN2O5S |
| CAS Number | 54-31-9 |
| Form | Solid |
| Solubility (25°C) | DMSO 60 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.
[3] No authors listed. IARC Monogr Eval Carcinog Risks Hum. Furosemide (frusemide)
[4] L L Ponto, et al. Furosemide (frusemide). A pharmacokinetic/pharmacodynamic review (Part I)
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