?? ???? ??? ??? ???? ???? ??? ??? ?? ????, ??? ??? ??? ???. ??? ??? ?? ?? ??? ???? ? ???? ???, ?? ???? ??? ???? ?? ? ??? ?????. ?????????? ?? ???? ???? ???? ???? ??, ???? ?? ?? ?? ?????? ? ?????.???????? ??? ?, ?? ???? ??? ???? ?????. ??? ??????? ?? ????? ??? ??? ??? ????, ???? ??? ????? ??? ??? ?????. ???? ???? ?? ???, ??? ???? ???????? ???? ??? ?

??????????????? ???? ???? ?? ????????? ???? ?? ?? ??, ????????? ???? ???? ?? ???? ?? ????????????? ????.Nitrates can also be found in some recreational prescription drugs which include amyl nitrate or nitrite ("poppers"). Using sildenafil which has a nitrate drugs could potentially cause a unexpected and severe reduce in blood pressure level.???? ?