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For oral dosage form (tablets): For gout: Adults—At first, 100 to 300 milligrams (mg) per day, taken once a day or in divided doses. trihexyphenidyl 2 mg Your doctor may adjust your dose as needed However, the dose is usually not more than 800 mg per day Children—Use and dose must be determined by your doctor For high uric acid levels caused by cancer medicines: