Symptoms: headache, nausea, vomiting, dyspepsia, leukopenia; agranulocytosis, crystalluria, intestinal colic, dizziness, drowsiness, depression, fainting, confusion, visual impairment, fever, haematuria. With prolonged overdose - thrombocytopenia, leukopenia, megaloblastic anemia, jaundice.
Treatment: abundant drinking; with accidental ingestion - gastric lavage.