Cystinosis patients, ages 1 to 18 years, with GI
symptoms were asked to participate in this study. All patients
received regular cysteamine bitartrate (Cystagon, Mylan,
Morgantown, WV) at a free-base dose of approximately 60
mg/kg/day. Acid suppressants, antibiotics, nonsteroidal antiinflammatory
drugs, prokinetic agents, and antihistamines
were discontinued one month before admission. A mean
leukocyte cystine level of