My hubby was taking Adderal for a few months and stopped for a few reasons. He's 33 yrs old and built like a linebacker, but all the same, he was on a low dosage. Suddenly, mid-day he would begin to see numbers transpose at work and feel dizzy. He actually compared the feeling to taking bad mushrooms or acid. MD immediately switched him to Focalin XR. Unfortunately, Focalin has some pretty bad side effects specifically for men, i.e. low libido and hair loss. So, we're back to the trusty standby Ritalin.