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This drug can cause giddiness, increased sleepiness, dry moth, urinary retention
and also possibility of coma
if taken in high dose relative to his body weight and metabolism
and excretion from his body. I advise you to get him to the ER immediately to get him looked at especially if he has any of the above symptoms. Kindly keep medication out of reach from him. Keep him well hydrated and well fed. Watch him for any danger signs. Do not delay.