Generally it is best to avoid the combination of alcohol and medication when you are feeling unwell. For most common antibiotics drinking alcohol in moderation is unlikely to cause problems. Antibiotics may have a variety of side effects which can be worsened by drinking alcohol. Alcohol may affect the efficacy of your antibiotic by altering how the body metabolizes the drugs
There are certain drugs which MUST NOT be taken in conjunction with alcohol Tindazole and Metronidazole as the combination can cause a serious reaction symptoms of which can include breathlessness, headaches, nausea and vomiting. Avoid alcohol whilst taking these medicines and for at least 72hours (3days) after stopping the antibiotic.
Always ask your physician or pharmacist for advice on combining alcohol with your antibiotic.