The aim of the work was to examine the influence of gender on pharmacokinetics of silymarin; a basic constituent of medicinal herb "milk thistle" (Silybum marianum). The presented work is the extension of published work of Usman et al. (16). The comparative parallel design pharmacokinetic study was conducted in Pakistani healthy volunteers (male and female) receiving a single 200 mg oral dose of silymarin. Sixteen subjects (8 males and 8 females) were enrolled and completed the 12 h study. Blood screening was done on HPLC and the pharmacokinetic parameters were calculated by APO, 3.2 Ver. software using non-compartmental and two compartment model approaches. A significant difference (p < 0.05) was observed in almost all calculated pharmacokinetic parameters of silymarin in male and female. Clinically, the silymarin has been underestimated in the previous study. Gender based clinical investigations should be directed in the future on other flavono-lignans of 'milk thistle' as well.
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