The only reason not to drink on antibiotics is because drinking makes them less effective.
Its very smart of you to not drink on the antibiotics...I do not want to encourage drinking on them..and everyone is different...I've never heard of anyone dying while drinking on antibiotics. I am an alcoholic (sober 5 years now), so therefore, I built a tolerance to alcohol...so that might be why I was always ok..I always drank when I was on my antibiotics and nothing ever happened....but there is always a first time for everything. Is it really important to drink alcohol that night? Maybe if it is that important to drink over finishing your course of antibiotics...there is another question you might be asking...such as do I have a problem with alcohol? Its just a thought.