Good morning... I have this question, the urologist prescribed me the drug erlis 5mg to take 5mg every day and 5mg before intercourse, unfortunately I do not use the drug every day, but only before intercourse. The first time after using 5mg 2h before intercourse the erection was good and even after intercourse, where I could have three or four intercourse as never before, another time after taking 5mg two hours before intercourse and adding half a tab 30 minutes before the erection was weak, and when it appeared, when changing the position it disappeared, I don't know if it could be the reason that the day before I took 100 mg of tramal and hypertension medication 10mg enarenal or just a drug doesn't work for me? And here I have a question: when does this drug work best?taken 30 minutes before intercourse or would it be better with 2 or 3 hours beforehand?because I am already starting to get a little stress before intercourse, whether I will have an erection or not. My last question, if you don't have erection problems, can taking this drug interfere with erections?, does it have no effect on it and should intensify it even more??? Thank you in advance for your reply.