I thought I was the only one that couldn't tolerate yohimbe. I tried the HCL form and would get nauseas for like 10-12 hrs., chills, feverish like I had the flu. Even tiny amounts of the herbal stuff does the same to me. But it gives me massive erections lol, but what good is that when I'm ready to vomit on her. Ephedrine HCL though is a different story could take 3 tabs and feel like it was a cup of coffee.