Pyrilamine is a histamine H1 receptor inverse agonist, it binds to a G protein-coupled form of the receptor and promotes a G protein-coupled inactive state of the H1 receptor that interferes with the Gq/11-mediated signaling.
| Molecular Weight | 401.46 |
| Formula | C17H23N3O1.C4H4O4 |
| CAS Number | 59-33-6 |
| 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.
[1] Dong-Chan Kim, et al. Pyrilamine inhibits nicotine-induced catecholamine secretion
[2] D L Greenman, et al. Chronic feeding study of pyrilamine in Fischer 344 rats
[3] D W Kelly, et al. The metabolism and elimination of pyrilamine maleate in the rat
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