You should not drink alcohol before surgery, and you must closely follow your surgical team’s specific fasting instructions for all drinks, including water, coffee, and other beverages.

Alcohol before surgery

Most medical sources advise completely avoiding alcohol for at least 48 hours before any planned operation, with many recommending 2–4 weeks of no alcohol if possible, especially for bigger surgeries. Drinking alcohol close to surgery can increase bleeding, interfere with anesthesia drugs, worsen pain control, and raise the risk of infections and other complications during recovery.

Heavy or regular drinkers have even higher risks, including withdrawal, heart and breathing problems, and longer hospital stays, so surgeons may ask them to stop drinking even earlier and sometimes offer support programs. If you did drink recently, it is important to tell your anesthesiologist honestly so they can adjust medications and decide safely whether to proceed or reschedule.

Water, coffee, and other fluids

Fasting rules for non‑alcoholic drinks are different and usually focus on preventing stomach contents from being vomited and inhaled into the lungs under anesthesia. Many modern guidelines allow clear fluids such as water or certain clear juices up to about 2 hours before anesthesia, but require stopping solid food and milky drinks for longer, often 6–8 hours or more.

However, exact cut‑offs can vary by hospital, country, and type of surgery, so your written pre‑op instructions always override general internet advice. If you accidentally drank something after the “nothing by mouth” time, you should inform the pre‑op nurse or anesthesiologist right away, because they may delay or modify the procedure for safety.

What you should do now

  • Follow the specific fasting sheet from your surgeon or hospital; do not drink anything beyond what they explicitly allow.
  • Stop all alcohol at least 48 hours before surgery, and longer (2–4 weeks) if your team has advised it or if you drink heavily.
  • If you have already had alcohol or broke fasting rules, call the surgical office or pre‑assessment clinic and tell them exactly what and when you drank.
  • Ask your anesthesiologist directly, “What can I safely drink and until what time?” at or before your pre‑op visit; they are the final authority on this.

Information gathered from public forums or data available on the internet and portrayed here.