If you are wondering whether antibiotics and alcohol mix, the first person you should ask is your doctor or the drugstore that supplied you with your medication.  I am not a medical professional and cannot tell you which type of medication will tolerate being mixed with alcohol.  My advice would be when you are taking any drug, not just antibiotics, alcohol should be avoided unless you have been specifically told otherwise by your doctor.  Having said that, here’s some general advice on the subject with references quoted at the bottom of the article.

One of the reasons why some drugs and alcohol don’t makes is that the alcohol will start competing with the drug and ultimately inhibit the drugs effect. Also, taking alcohol with some drugs can produce side-effects, some of which are going to be harmful. When it comes to alcohol and antibiotics, it is “unlikely” that moderate consumption of alcohol will cause any problems when taking the more common prescriptions.[i]

You should avoid consuming any alcohol while on the following antibiotics:

Metronidazole

This antibiotic is used primarily for anaerobic bacteria and protozoa. Any alcohol with this drug can cause vomiting and nausea, skin flushing, accelerated heart rate, and shortness of breath.[ii]

Tinidazole

This antibiotic is used to treat certain infections. It is commonly used to fight infection in the intestines, the vagina, and to treat some sexually transmitted problems. You mustn’t drink alcohol while you are taking this antibiotic or you may experience similar symptoms as those outlined above, and you mustn’t drink for at least three days once your treatment has been completed.

Other antibiotics which can cause complications if taken at the same time as alcohol include Co-Trimoxazole, Linezolid, and Erythromycin. If you are unsure about consuming alcohol with any drug that you are taking, just don’t drink! Follow this advice until you have at least had a chance to talk to your GP.