I used Generic Minoxidil 5% for Men. I used it on a much larger area than recommended and, I use a larger dose. At first I noticed low quality erection, about 15 days after starting treatment. By day 21 I was unable to get an erection at all, and my libido was very low. I immediately stopped using Generic Minoxidil 5% for Men. My erections gradually returned to normal over two weeks. Losing the ability to get an erection is very disconcerting. Thankfully the effect is only temporary. I also noticed other side effects, my blood pressure went from 120/64 to 99/58. My tinnitus was less also. Having a blood pressure of 99/58 makes you feel less energetic. Had I used Generic Minoxidil 5% for Men in a smaller area as directed, and if I used the proper dosage, the side effects may have been not noticeable. I got greedy and the side effects were intolerable. I used 2/3s of one can. Costco refunded my money in full when I returned the product.