Of course you can drink beer while on the hcg diet. However you should note few things when considering hcg diet. Drinks, however should not be taken in higher quantities
The reason? Alcohol is completely prohibited by the hcg diet. This is because alcohol has sugar content in it and according to hcg diet you are not supposed to consume any amount of sugar.
When you consume alcohol on the hcg diet you are making your body to store more fat than before. Hence, there is a strong possibility that you will gain weight rather than lose weight with hcg diet.
In short you are not supposed to drink alcohol on the hcg diet.