I've taken 400 mg of Provigil & 72 mg of Concerta (as well as a bunch of other drugs for bp) for about 5 years & I have had no neg. side effects from the Provigil or Concerta. I don't think I could function without them. I haven't had to increase my dosage of either of them in all that time. I can have motivation to do things & enough energy to accomplish stuff during the day , which I didn't before.

A few other things to consider for low energy--I also have low thyroid, pernicious anemia--both of them cause fatigue & depression. That's all I needed on top of my bp, but I take meds for both of those conditions. Having a thorough physical is important to rule out other conditions.--Suzy