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I am sure this is a frustrating problem for you, but the key to getting his polyuria and polydipsia (PU/PD) which means increased drinking and increased urinating under control is to get his diabetes under control. There is no medication that will decrease his urine production and withholding water can be dangerous.
Has he had a blood glucose curve run yet?
Have you been taught how to measure his blood glucose at home?
What insulin is he on and how many units is he getting?