hiiii not only medicines will help u have to think ab surrounding factors like relationship daily stress thoughts art of sex mutual communications with partner bed room environment interference by other family memb like children etc because with only sound mind and sound environment u can able to achieve good erection the medication on u are also producing some kind of erectile problems viagra is good molecule but with that drug u have to deal with other factors that i have mentioned sunset focus technique is very useful method plz read on google ab it thank u