This is to be a double blind, randomized trial with cross over of 12 patients with chronic sarcoidosis on stable systemic therapy. Patients will be screened for fatigue using a modified SNAP and Facit-F scores. Patients will be in the study for 20 weeks. Objective of study: To determine the effect of dexmethylphenidate hydrochloride, (d-MPH)(Focalin) on fatigue in Sarcoidosis. The is a common complaint in sarcoidosis, related to the chronic inflammatory nature of the disease. It may also related to therapy for the disease.