Taking CBD with alcohol at the same time is not a good idea. Both substances reduce blood pressure in your body. When taken together, this might cause your blood pressure to drop too far, which would cause dizziness and possible fainting. CBD and alcohol are both considered sedatives and hypertensives, namely blood pressure lowering agents. If you use them together, it can result in a much more substantial impact that might lead to side effects like dizziness, sedation, and fainting. While taking CBD and alcohol together is not likely to produce much more than a mild side effect, it’s a good idea to keep them separate when you can.