chronic fatigue syndrome
"In my opinion, there are a lot of pros and cons for this medication. I took it for a while with no ill effect, but something must have changed, and it made me feel extremely ill (dizziness, heart palpitations, nausea, headache.)  I stopped taking it because of this and definitely noticed a difference. I think that taking a half a pill every few hours has eliminated my problems with the medication and works to keep me awake and focused for longer."