[teerapong]

I have used it, but not as medicine, but in the form of chocolate candy

I felt the negative effects
Heart rate becomes faster
Headaches like migraines but are felt more at the top (crown) and back of the head.
The back of the neck and shoulders become tighter/stiff.
Feeling like symptoms of having a stroke such as tingling

but the positive effect is that erections are faster even though they are not overly stimulated and can last a long time