Never Drink and Play
This is a common casino rule that applies to both land-based casinos and online casinos. Drinking when you play never leads to anything good. It is ok to have a drink or two, but it is not a good idea to drink excessive amounts of alcohol.
When you drink, your decision-making skills are dulled, which means you could end up making silly mistakes and you could be spending a lot more money then you want to.
Also, if you are losing and drinking you are more likely to chase your losses and you could end up in a financial hole.