benzofurans and Renal-Insufficiency

Tasimelteon is a circadian regulator that resets the master clock in the suprachiasmatic nuclei of the hypothalamus by binding to both melatonin MT1 and MT2 receptors making it a dual melatonin receptor agonist. Tasimelteon has been approved by the United States Food and Drug Administration for the treatment of Non-24-Hour Sleep-Wake Disorder (Non-24). Two prospective, single-center, open-label studies evaluated the pharmacokinetics of tasimelteon and its main metabolites after a single 20 mg dose administered to subjects with mild or moderate hepatic impairment or severe renal impairment, including subjects on dialysis compared to healthy controls. In subjects with mild or moderate hepatic impairment, exposure to tasimelteon after a single 20 mg dose, as measured by area under the plasma concentration-time curve to infinity, was increased by approximately 2-fold. There was no apparent relationship between tasimelteon clearance and renal function. No safety concerns were apparent in either study. Based on these results, the changes in the pharmacokinetics of tasimelteon due to mild or moderate hepatic or severe renal impairment are not considered clinically relevant, and no dose adjustment is necessary in these patients.

Topics: Adolescent; Adult; Aged; Area Under Curve; Benzofurans; Cyclopropanes; Female; Half-Life; Humans; Liver Diseases; Male; Metabolic Clearance Rate; Middle Aged; Receptors, Melatonin; Renal Dialysis; Renal Insufficiency; Severity of Illness Index; Sleep Disorders, Circadian Rhythm; United States; Young Adult

To evaluate the pharmacokinetics of prucalopride in individuals with renal impairment (RI).. This open-label Phase I study (ClinicalTrials.gov identifier: NCT01674192) enrolled men and women aged 18-75 years who were classified by renal function: normal renal function (creatinine clearance ≥ 80 mL/min/1.73 m²), mild RI (50-79 mL/min/1.73 m²), moderate RI (25-49 mL/min/1.73 m²), and severe RI (≤ 24 mL/min/1.73 m²). All received a single oral dose of prucalopride 2 mg.. Thirty-four individuals (normal renal function: 10; mild RI: 8; moderate RI: 7; severe RI: 9) received prucalopride. In all groups, maximum plasma concentration was reached within 2-4 hours. There was no significant difference in exposure (area under the plasma concentration-time curve from time zero to infinity) between participants with mild RI and those with normal renal function. However, area under the plasma concentration-time curve from time zero to infinity values were 1.5- and 2.3-fold higher (P = 0.002 and P < 0.001) in patients with moderate RI and severe RI, respectively, than in those with normal renal function. The proportion of total body clearance accounted for by renal clearance was significantly reduced in those with RI.. Clinically meaningful reductions in renal clearance were seen in participants with severe RI, which supports a decrease from the standard dose of prucalopride 2 mg daily to 1 mg daily in these individuals.

Topics: Administration, Oral; Adult; Aged; Area Under Curve; Benzofurans; Case-Control Studies; Creatinine; Female; Humans; Male; Middle Aged; Renal Insufficiency; Serotonin 5-HT4 Receptor Agonists; Severity of Illness Index; Time Factors