Didanosine (Videx, Videx EC) is a reverse transcriptase inhibitor with an IC50 of 0.49 μM. It is effective against HIV and used in combination with other antiretroviral compound therapy as part of highly active antiretroviral therapy (HAART).
| Molecular Weight | 236.23 |
| Formula | C10H12N4O3 |
| CAS Number | 69655-05-6 |
| Solubility (25°C) | DMSO 40 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] David A Cooper. Update on didanosine
[3] R B Pollard. Didanosine once daily: potential for expanded use
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