Abstract: The present disclosure relates to methods and drug delivery systems for treating diseases involving inflammation, including Attention Deficit Hyperactivity Disorder (ADHD) by administering a CNS stimulant to a patient in need thereof so as to maintain steady state serum drug levels that remain therapeutically effective for about 24 and ½ to about 25-27 hours or longer after administration to maintain a constant steady state between doses of medication. The method is employed to restore normal catecholamine levels throughout the day without over-stimulating or under-stimulating the patient. Additionally, the present method of treating inflam?na?ion3 including ADHD, provides, for example, dosing once a day or once a week. The present method also addresses other aspects of the disease, for example, defective P-5-P synthesis, ehminating interleukins and free radicals, and correction of Amino acids, the endocrine system and inflammation.