Allergic reactions (skin rash, itching, urticaria, angioedema), nausea, epigastric pain, anemia, thrombocytopenia, agranulocytosis, dry mouth, dizziness, paresis of accommodation, mydriasis, blurred vision, vomiting, decreased potency, urinary retention.
With prolonged use in large doses - hepatotoxic effect, hemolytic anemia, aplastic anemia, methemoglobinemia, pancytopenia; nephrotoxicity (renal colic, glucosuria, interstitial nephritis, papillary necrosis).