Adderall / High Blood Pressure | ADHD Information

My son is on 30mg of Adderall and 2 mg of Clonidine for ADHD.  The school he attends was randomly checking kids blood pressure 2 weeks ago.  On the day they checked my son's his was high so they have been checking it periodically since then.  Well, they called this morning and stated that it was high again this morning and suggested I put a call in to his doctor.  They stated that the bottom number was fine, but the top number was a little high.  My son is also about 35lbs over weight.  I am very concerned.  Has any of your children experienced high blood pressure due to Adderall or other ADHD Meds?

Any advice would be appreciated.

Thanks!