??? ???? ?? ??? ??????? ??? ?? ?? ?? ????? ???? ?? ???? ???? ??? ???? ?????, ?? ??? ??? ??? ?? ???? ???.? ????/? ???? ?????? ???? ??? ?? ???? ??? ?????? ???? ?? ??? ?? ??? ???? ?? ? ? ??? ?? ? ?? ???? ?? ??? ??? ?? ??? ??? ?? ????.???, ??? ?? ?? ???? ????? ????? ?? ?? ?? ?????,???? ??? ??? ?? ???? ???? ??? ??,?? ??. ?? ??????? ???? ?? ? ?????? ????

Sildenafil and/or N-desmethylsildenafil, its major Lively metabolite, could be quantified in plasma, serum, or full blood to evaluate pharmacokinetic position in those getting the drug therapeutically, to verify the prognosis in possible poisoning victims, or to aid inside the forensic investigation in the circumstance of lethal overdose.[forty sev