Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0019158 (hepatitis)
 30,205 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The pharmacokinetics of hexobarbital were studied in 13 patients with acute hepatitis. Hexobarbital sodium was administered by zero order intravenous (iv) infusion, and plasma concentrations were determined regularly by gas chromatography. For each patient the data were fitted according to 2-compartment kinetics. The results were compared to those obtained for 14 healthy volunteers. The elimination half-life of hexobarbital was 490 +/- 186 min in the hepatitis patients and 261 +/- 69 min in the control group. Clearance was significantly reduced in the hepatitis group, whereas the volume of distribution at steady state was not significantly altered. For some patients the initial distribution volume was reduced. In 6 patients the experiment with hexobarbital was repeated after apparent recovery from hepatitis as judged by normal transaminase and bilirubin levels. Generally the half-life of hexobarbital was shorter and the clearance value was higher than during the acute illness, but the values had not yet returned to normal. Clinical recovery from liver disease is not accompanied by corresponding recovery of drug-metabolizing capability.
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PMID:Pharmacokinetics of hexobarbital in acute hepatitis and after apparent recovery. 116 25

Although for many analyses tandem mass spectrometry (LC-MS/MS) systems have significant advantage over the high-performance liquid chromatography with diode array detection (HPLC-DAD) however, the HPLC methods are easier, cheaper and more available to perform. As no published method is available for quantitative HPLC analysis of sofosbuvir (SOF), an orally administered anti-hepatitis drug in human serum, this study was aimed to evaluate applicability of the HPLC technique to quantify sofosbuvir and comparison of the two methods for analytical performance. Following extraction of the drug and an internal standard (Hexobarbital), same chromatographic conditions were used for both the systems. After the chromatographic separation on a reverse phase C18 column using a mobile phase consisting of water (containing formic acid 0.5mL/L) and acetonitrile (57:43; v/v) at a flow rate of 0.8mL/min, the eluate was introduced into a DAD detector set at 261nm, then passed through the mass spectrometry system in single ion monitoring mode (SIM). For UV and mass spectrometry detections the calibration curves were linear over a concentration range of 25-3200 and 10-3200ng/mL, respectively and the linearity was over 0.998 for both the systems. Lower limit of quantification (LLOQ) for mass spectrometry and DAD detections were 10 and 25ng/mL, respectively. In conclusion sensitivity of DAD detection is sufficient enough to determine concentrations down to 0.5% of Cmax which achieved in bioequivalence study of sofosbuvir and meet FDA requirements for these types of studies.
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PMID:Development and validation of a new HPLC-DAD method for quantification of sofosbuvir in human serum and its comparison with LC-MS/MS technique: Application to a bioequivalence study. 2885 53