tokens: A total of 38 consecutive patients who presented to our clinic with impotence received 0 . 2 ml . of a combination of 3 drugs : 6 mg . papaverine , 100 micrograms . phentolamine and 10 micrograms . prostaglandin E1 with ( pH 7 . 05 ) or without ( pH 4 . 17 ) the addition of sodium bicarbonate ( 0 . 03 mEq . ) .