"it worked great at 40mg, i had some slight tongue swelling, just thought i needed caffeine because that solved the issue. we upped it to 80mg after 3 years of being on it. had to go to the hospital for a severe allergic reaction. i kept taking it at 40 but even then the allergic reactions were mild but still happening. accidentally took it twice within 8 hours and was again taken to the hospital. some ingredient in there i&#039;m allergic too."