Alcohol is a diuretic. What this means is, when you drink alcohol, you produce more urine. This happens because alcohol suppresses release of arginine vasopressin or anti-diuretic hormone (ADH), the hormone that allows your
kidneys to return water to your bloodstream. The effect is additive, so drinking more alcohol increases the level of dehydration . Another part of the reason you visit the bathroom more often is because alcohol also stimulates the bladder, so you'll feel the urge to pee sooner than you would ordinarily.