I will try to make this brief. I was on Timolol for a year and a half and during that time experienced a drastic negative effect on libido and general energy. I made no connection between the eyedrops and my condition till the 18th month of use. During the period I had checked everything and tried all kinds of solutions to no avail. A consultation with my doctor where he asked about any medication i had been using for several months suddenly set off a light bulb in my head and I decided to stop using the eyedrop that same day. 48 hours later, I was back to normal. I have since been put on Latanoprost and all is well. Thought I'd put this out there to help any guys who may be experiencing same. Good luck.
You can get dorzamide in place of timolol. No side effects.