Alcoholic beverage taken during your treatment of Lexotanil (Bromazepam) is highly discouraged. It increases CNS depression and impairs learning capacity. I'm sure your doctor has mentioned a couple of the side effects of taking both (slowed breathing, decreased heart rate, drowsiness, slurred speech, impaired sensation and perception, reduced working memory, decreased attention and slowed reflexes).
Also, it is metabolized in your liver and so is alcohol. Taking both will make your liver be introduced to more toxins.
Think about it.