Sir My Age Is 23 I Have Been Masturbating From

sir my age is 23 i have been masturbating from many years , from 1 year i m suffering from gastric problem recently i consulted gasteroentrologist he given me tabs and one of the tab is antidepressant i have been using it for 1 week . But from 2 days when i m masturbating not able to hold my penis erect and the semen doesnt come out