It doesn't work unless you take it on an empty stomach. An hour after taking it, my nose gets stuffy and my face gets hot. As a result, when I'm tired after a day of activity, the bloodshot eyes feel like dry eyes, and I get hot and sleepy. My eyes get bloodshot and I unconsciously close them more often, so I often fall asleep. But once the act starts, even if I feel sleepy, I keep it on until the friction of the female genitals stops. Also, if I take it when I'm feeling horny, the friction of my pants can make my genitals hard, which can be a problem. So far, there has been no damage to my internal organs from taking it. I'm satisfied with it, as it lasts until the maximum hardness stops. My girlfriend also gets as hard as a rock...she said it's a lethal weapon...I recommend it! But it takes 3 weeks to arrive.