Question: Hello, I am a 32 years old/male. Currently on medicines related to increase sexual vitality like Nanoleo and Eutrial-AT. and after taking these medicines, my sex drive get improved a lot. My question is: Yesterday, I went to bed at 11.30 PM and I was very in good mood. I kept on fantasising about my girl friend and had very hard erection. Due to continuous fantasising I did not had good deep sleep till 5.30 AM morning and throughout from 11.30 PM till 5.30 AM, I kept on fantasising and had good hard erection.(as I have mentioned I did not had good deep sleep till 5.30 AM, but I am not sure might be I slept in between a little and then wake up and again felt on sleep for a while). So, my concern is, I am correlating this with the effect of Viagra pills. Like a known side effect of Viagra is, if erection not come down after 4 hours of Viagra intake then it can cause permanent harm to the penile veins. In my case, I was not on Viagra but the had contentious erection of duration 6 hours. I am worried now, is this really make any problem to my penile veins? Is my fear is reasonable? Please help. Thanks, XXXXXXX