title: Letter: Azathioprine and allopurinol.
mesh_terms: D000493:Allopurinol / Q000008:administration & dosage*; D001379:Azathioprine / Q000008:administration & dosage*; D004347:Drug Interactions; D006801:Humans
chemical_list: D000493:Allopurinol; D001379:Azathioprine