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Clinical Chemistry 30: 230-233, 1984;
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Clinical Chemistry, Vol 30, 230-233, Copyright © 1984 by American Association for Clinical Chemistry

Liquid-chromatographic determination of two antidepressants, trazodone and mianserin, in plasma

SH Wong, SW Waugh, M Draz and N Jain

Plasma containing trazodone or mianserin was extracted. The organic phase containing trazodone was evaporated and the residue was reconstituted in dilute acid. Mianserin was back-extracted from the organic phase with dilute acid. Both drugs were chromatographed on mu Bondapak C18 columns, with phosphate/acetonitrile as the mobile phase. Peak-height ratios of drug/internal standard were linearly correlated with concentrations between 25 and 2000 micrograms/L for trazodone, and between 25 and 200 micrograms/L for mianserin, with respective between- run CVs of 4.7% and 7.6%. Detection limits were 5 ng. Of some common drugs and metabolites examined, nortriptyline co-elutes with the internal standard used in the trazodone assay, while flurazepam co- elutes with mianserin. Concentrations of trazodone in 26 patients ranged from 73 to 1678 micrograms/L. For two geriatric patients, concentrations were about 2000 micrograms/L. For two overdose patients, they were about 5000 micrograms/L. The concentration of mianserin was 27 micrograms/L for a volunteer treated with a single 40-mg oral dose.




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Copyright © 1984 by the American Association for Clinical Chemistry.