Hello Dr. Actually I do gym nd I take protein powder .nd m going to physical with my gf if I take viagra for better sex than there's any chances for side effects? Bcz I take protein powder actually one of my frnd said me there's a side effect if you going to take viagra bcz you already take your protein powder. Or m not getting anything my penis it's harder or sperm came out with in 40 seconds m nt satisfied to my sex partner what to do. I already do gym I take protein also but still I having these problems.