Assertion: promethazine | /r/HasProperty | observed after administration
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Source sentences:
text: Although more than 80% is absorbed, promethazine undergoes extensive first-pass hepatic glucuronidation and sulfoxidation, resulting in low absolute bioavailability of approximately 25%.67 Peak plasma concentrations of promethazine (2.4–18.0 ng/mL) are observed between 1.5 and 3 hours after administration (Fig.