Fasting Before Bladder Removal (Cystectomy)

A radical cystectomy removes the bladder to treat bladder cancer, almost always under general anaesthetic, and is usually combined with a new way to pass urine (a urostomy/stoma or a neobladder). It is major surgery with a planned hospital stay, so the fasting and preparation steps below matter and your team will guide you through each one.

Fasting for this procedure

Cystectomy is done under general anaesthetic, so you will be fully asleep and your stomach must be empty to keep the airway safe. Following the usual rule, stop eating solid food and milky drinks about 6 hours before your arrival time, and you may keep drinking clear fluids (water, black tea or coffee, clear squash) until 2 hours before you are due in. Many hospitals run an ERAS (Enhanced Recovery After Surgery) programme and will give you specific carbohydrate drinks to take the evening before and a few hours before surgery; if so, follow those instructions exactly, as they replace the standard advice and are timed to be safe right up to the cut-off. Always go by the exact arrival and fasting times printed on your admission letter.

Medicines to check

Blood thinners need a clear plan. Drugs such as warfarin, apixaban, rivaroxaban or clopidogrel raise bleeding risk in this long operation and are usually stopped several days ahead, sometimes with a bridging injection. See medications to stop before surgery and confirm exact dates with your surgeon.

Diabetes medicines change while you fast. Tablets like metformin and insulin doses must be adjusted, especially with bowel prep and a long fast, and SGLT2 inhibitors (the 'flozin' tablets such as empagliflozin, dapagliflozin or canagliflozin) usually need stopping about 3 to 4 days earlier than other diabetes drugs. Read diabetes tablets before surgery and ask for a written plan, as cystectomy often means a longer time without normal eating.

Take your heart and breathing medicines (including inhalers) as usual on the morning of surgery with a small sip of water, unless your team has told you to hold one. Blood pressure medicines are different: follow the specific instruction you are given, because some - especially ACE inhibitors or ARBs (such as ramipril, lisinopril, losartan or candesartan) and water tablets (diuretics) - are often paused on the day of a big operation to keep your blood pressure stable.

Stop herbal remedies and supplements such as fish oil, garlic tablets, turmeric and St John's Wort about a week before, as some affect bleeding or the anaesthetic.

Bring every medicine, inhaler and patch in its original box so the ward and anaesthetic team can check doses for your stay.

If you are given bowel preparation, take it exactly as timed; it empties the bowel that may be used to build your stoma or neobladder and works alongside, not instead of, your fasting instructions.

When this surgery may be delayed

A urine or chest infection, or a fever, on the day, which is treated first because this is a long operation with reconstruction.

Blood thinners not stopped at the right time, or blood results showing your clotting or kidney function is not yet safe for surgery.

Not following the fasting or bowel-prep instructions, which can make anaesthesia unsafe or leave the bowel unsuitable for forming a stoma or neobladder.

No critical care or high-dependency bed available, since recovery after cystectomy often begins in ICU or HDU.

New heart, lung or anaesthetic concerns found at your pre-assessment that need optimising before such major surgery.

Reports & documents to carry

Your admission letter with the exact fasting and arrival times, plus any ERAS carbohydrate-drink instructions.

All current medicines in their original boxes, including blood thinners, insulin, inhalers and patches.

Recent scans, blood tests, biopsy results and clinic letters relating to your bladder cancer.

Any stoma-care information, sample pouches or the skin marking from your stoma nurse appointment.

A packed bag for a longer stay (often a week or more) with toiletries, loose clothing, glasses, and contact details for your next of kin.

What to ask your anesthesia team

Will I have a urostomy (stoma) or a neobladder, and have I seen the stoma nurse to mark the site and learn the basics beforehand?

Do I need bowel preparation, and exactly when should I take it around my fasting times?

Am I on the ERAS pathway, and which carbohydrate drinks should I take and when?

Exactly when should I stop my blood thinner and diabetes medicines, and do I need any bridging injections?

Will I wake up in ICU or a high-dependency unit, and roughly how long is the hospital stay likely to be?

Your prep checklist

Tick things off as you sort them — saved on this device only, nothing is sent anywhere.

A general guide — your hospital's own instructions always come first.

Frequently asked questions

Why do I need bowel preparation as well as fasting?

Fasting empties your stomach so anaesthesia is safe, while bowel preparation clears the intestine itself. Cystectomy usually uses a piece of your bowel to build the urostomy or neobladder, so that segment needs to be as clean and empty as possible. Not every hospital uses full bowel prep nowadays, but if yours does, take it at the exact times given alongside your clear-fluid instructions, and keep sipping clear fluids to avoid becoming dehydrated.

Why do I see a stoma nurse before the operation?

If you are having a urostomy, your stoma nurse meets you beforehand to mark the best spot on your abdomen, away from creases, your beltline and scars, while you sit and stand. They also explain how a urostomy pouch works and answer worries early, so it feels less daunting afterwards. This planning happens before your fasting starts and makes a real difference to comfort and confidence once you are recovering on the ward.

Will I really need intensive care after bladder removal?

Often, yes, at least for the first day or two. A radical cystectomy is long, major surgery, so many patients recover initially in an ICU or high-dependency unit where breathing, fluids, pain and the new urinary diversion can be watched very closely. This is routine and planned, not a sign something has gone wrong. From there you move to a normal ward, and the overall stay is commonly a week or more depending on how your bowel and recovery progress.

What are the ERAS carbohydrate drinks, and do they break my fast?

ERAS (Enhanced Recovery After Surgery) uses specially formulated clear carbohydrate drinks to reduce the stress of surgery and help recovery. They are designed to be safe up to about 2 hours before your operation and do not count as breaking your fast in the way a meal or milky drink would. Only take the drinks your hospital provides, at the times they specify, and do not add anything else once your solid-food cut-off has passed.