Prazosin hydrochloride

Biological Activity

Prazosin hydrochloride, a Quinazoline derivative, is a well-tolerated, CNS-active α1-adrenergic receptor antagonist for the research of high blood pressure and alcohol use disorders. Prazosin hydrochloride potently inhibits Norepinephrine (NE)-stimulated 45Ca efflux with an IC50 of 0.15 nM. Prazosin hydrochloride inhibits organic cation transporters OCT-1 and OCT-3 with IC50s of 1.8, and 13 μM, respectively.

Chemical Information

Molecular Weight	419.86
Formula	C19H21N5O4·HCl
CAS Number	19237-84-4
Solubility (25°C)	DMSO 7 mg/mL
Storage	Powder          -20°C   3 years ;  4°C   2 years In solvent       -80°C   6 months ;  -20°C   1 month

Conversion of different model animals based on BSA (PMID: 27057123)

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 K_m factor for a mouse and then divide by the K_m factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.

References

[1] Haagsman AN, et al. Vet Rec. Comparison of terazosin and prazosin for treatment of vesico-urethral reflex dyssynergia in dogs.