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Pharmacokinetics and safety of tiagabine in subjects with various degrees of hepatic function.

Abstract：

PURPOSE:To evaluate the pharmacokinetics and safety of multiple oral doses of tiagabine HCl in subjects with different degrees of hepatic impairment. METHODS:Four subjects with mild hepatic impairment, three subjects with moderate hepatic impairment, and six matched normal subjects received twice daily oral tiagabine HCl for 5.5 days. Serial blood specimens were obtained for 48 h after the final dose. Total and unbound tiagabine plasma concentrations were determined by high-performance liquid chromatography (HPLC) and ultrafiltration, respectively. Pharmacokinetic parameters were compared between the groups by analysis of covariance. RESULTS:For total tiagabine concentrations in normal subjects and subjects with mild and moderate hepatic impairment, C(max) values (mean +/- SD) were 117 +/- 54, 172 +/- 40, and 172 +/- 28 ng/ml; C(min) values were 13 +/- 4, 27 +/- 4, and 28 +/- 6 ng/ml; areas under the plasma concentration-time curve were 396 +/- 59, 633 +/- 16, and 675 +/- 32 ng x h/ml, and elimination half-lives (harmonic means) were 7, 12, and 16 h, respectively. Unbound tiagabine concentrations, area under the unbound plasma concentration-time curve, and the free fractions were increased in the hepatically impaired subjects. Reduced serum albumin and alpha1-acid glycoprotein concentrations may have contributed to increases in the unbound fraction. Adverse events observed included dizziness, tremor, nausea, somnolence, incoordination, and unsteady gait. The frequency of these events was increased in the subjects with liver impairment. CONCLUSIONS:Because of the decreased drug elimination caused by liver function impairment, reduced doses or increased dosing interval or both may be needed to attain therapeutic plasma drug concentrations. Time to reach steady state also may be prolonged. The patients should be monitored closely for potential neurologic adverse events.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Lau AH,Gustavson LE,Sperelakis R,Lam NP,El-Shourbagy T,Qian JX,Layden T

doi

10.1111/j.1528-1157.1997.tb01734.x

subject

Has Abstract

pub_date

1997-04-01 00:00:00

pages

445-51

issue

eissn

0013-9580

issn

1528-1167

journal_volume

pub_type

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Pharmacokinetics and safety of tiagabine in subjects with various degrees of hepatic function.