Dược Động Học :
▧ Absorption :
Approximately 50% bioavailability orally.
▧ Volume of Distribution :
* 1.4 L/kg
* 1.76 L/kg [clinically significant renal function impairment (creatinine clearance 25 to 35 mL/min)]
▧ Protein binding :
15%
▧ Metabolism :
Hepatic. Ranitidine is metabolized to the N-oxide, S-oxide, and N-desmethyl metabolites, accounting for approximately 4%, 1%, and 1% of the dose, respectively.
▧ Route of Elimination :
The principal route of excretion is the urine (active tubular excretion, renal clearance 410mL/min), with approximately 30% of the orally administered dose collected in the urine as unchanged drug in 24 hours.
▧ Half Life :
2.8-3.1 hours
▧ Clearance :
* 29 mL/min [clinically significant renal function impairment]
* 3 mL/min/Kg [neonatal patients]