Surgery Journey
Preparing for Surgery: Fasting, Medicines and the Days Before
Preparing for Surgery: Fasting, Medicines and the Days Before
Good preparation is part of the treatment. This guide brings together the instructions that apply to almost every planned operation. Your own team's instructions always come first, because they know your operation and your health.
Fasting: The 6, 8 and 2 Rule
Fasting before an anesthetic keeps you safe, but fasting far longer than needed makes you thirsty, dehydrated, and anxious, and does not make the anesthetic safer. Unless the anesthesia team gives you different times, the standard rule for healthy adults is:
A light meal
- Last allowed time before anesthesia
- Up to 6 hours before
A heavy, fatty, or fried meal or meat
- Last allowed time before anesthesia
- Up to 8 hours before
Clear fluids
- Last allowed time before anesthesia
- Up to 2 hours before
Clear fluids are water, pulp-free juice, black tea or coffee without milk, and special carbohydrate drinks made for surgery. If your unit gives you a carbohydrate drink, finish it no later than 2 hours before your operation; if you have diabetes, the team will tell you whether to take it. People with delayed stomach emptying, bowel obstruction, or poorly controlled diabetes may be given different instructions.
Medicines: Stop Only When Told
- Bring an up-to-date list of everything you take: prescribed medicines, injections, inhalers, supplements, and herbal products.
- The team will tell you which medicines to stop and which to continue, and when. Do not stop any medicine unless you are told to.
- Some medicines need a personal plan well before surgery. This series has separate guides for diabetes medicines, blood thinners and aspirin, and weight-loss injections. Read the ones that apply to you.
- If you use a weight-loss or diabetes injection, tell the team the product, the dose, and the date of your last dose well in advance. Do not decide yourself whether to stop it.
Smoking and Alcohol Before Surgery
- Stop cigarettes, shisha, and vaping, ideally at least 4 weeks before surgery. Stopping now still helps, even if your operation is sooner.
- Tell the team honestly how much alcohol you drink. Heavy daily drinking makes sudden stopping dangerous, and the team may arrange supervised support instead.
- Bring your medicines list up to date at the same time. Reconciling the list, so the hospital record matches what you actually take, prevents mistakes.
The Night Before and the Morning of Surgery
- Follow the fasting times in this guide and any message from your hospital about when to arrive.
- Take only the medicines your team told you to take, with a small sip of water if allowed.
- Bring your medicine list, your written questions, and any letters or cards the hospital asked for.
- Remove nail polish and jewellery as your hospital advises, and arrange who will take you home, because you must not drive yourself after an anesthetic or strong painkillers.
When to Contact the Team Before Your Operation
- You develop fever, a cough, a cold, or any new illness in the days before surgery.
- You have eaten or drunk inside the fasting window by mistake. Be honest: the team may simply delay the start, and hiding it can be dangerous.
- You stopped, started, or changed any medicine, including injections bought without prescription.
- Your condition suddenly worsens, for example new severe pain or vomiting.
Full guide written by Dr. Tamer Elalfy