Peripheral neuropathy. Nausea, vomiting, epigastric distress, pancreatitis; elevated serum transaminases (ALT, AST) & bilirubin conc, hepatitis w/ or w/o jaundice; agranulocytosis, hemolytic, sideroblastic or aplastic anemia, thrombocytopenia, eosinophilia; fever, skin eruptions, lymphadenopathy, vasculitis; pyridoxine deficiency, pellagra, hyperglycemia, metabolic acidosis, gynecomastia; rheumatic & SLE-like syndrome.