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Before your biopsy

Preparing for a — Prostate Biopsy

Most people find the preparation for a prostate biopsy more daunting than the procedure itself. The three questions asked most often are about the enema, what to do with regular medicines, and why antibiotics are needed — and each has a clear answer that depends on which biopsy route your urologist plans to use.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • Antibiotics are standard — Prophylactic antibiotics before a prostate biopsy are routine care, recommended by major urology bodies worldwide.
  • Enema depends on the route — A bowel enema is typically needed before a transrectal biopsy but not before a transperineal one.
  • Blood thinners need medical review — Do not stop or continue blood-thinning medicines without speaking to your team — the right answer depends on why you take them.
  • Ask for written instructions — Preparation varies between centres and biopsy types. Written instructions from your team take precedence over anything you read elsewhere.
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Before a prostate biopsy you will receive prophylactic antibiotics, you may need a bowel enema depending on which route is used, and any blood-thinning medicines must be reviewed with your doctor in advance. The exact preparation varies between centres and biopsy techniques, so follow your team's specific instructions.

Do I need an enema before a prostate biopsy?

Whether you need an enema depends on which biopsy route your urologist has planned.

For a transrectal biopsy, where the needle passes through the rectal wall, a cleansing enema is given beforehand to reduce bacteria in the rectum and lower the risk of infection carrying into the prostate.

For a transperineal biopsy, where the needle passes through the skin of the perineum instead, bowel preparation is generally not required — and this lower infection risk is one reason transperineal biopsies are now preferred at many urology centres.

Your team will tell you whether you need an enema, and if so whether to do it at home before you leave or at the clinic on arrival.

Do I need to stop blood thinners before the biopsy?

Any medicine that affects bleeding needs to be discussed with your team before the biopsy — this includes aspirin, clopidogrel, warfarin, and newer anticoagulants.

Do not stop these medicines on your own. Some blood thinners are prescribed for conditions where pausing them carries a greater risk than the biopsy bleeding itself, and that decision requires medical input.

Mention any supplements you take too, including fish oil and vitamin E, as these can also increase bleeding.

Antibiotics are handled separately by your team. You do not decide whether to take them — they are prescribed as part of the procedure.

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What do words like bowel prep and anticoagulant mean?

Prophylactic antibiotics
Antibiotics given before a procedure to prevent infection, not to treat one already present. Standard before a prostate biopsy.
Bowel prep
A cleansing enema used before a transrectal biopsy to reduce the number of bacteria in the lower bowel at the time of the needle pass.
Anticoagulant
A medicine that slows blood clotting — warfarin and the newer direct oral anticoagulants are common examples. Must be reviewed before any invasive procedure.
Antiplatelet
A medicine that reduces the ability of platelets to clump and form clots. Aspirin and clopidogrel are the most common. Needs to be discussed before your biopsy.
Transrectal biopsy
A biopsy where the needle enters the prostate through the rectal wall. Requires bowel prep beforehand and carries a higher infection risk than the transperineal approach.
Transperineal biopsy
A biopsy where the needle enters through the skin between the scrotum and the anus rather than through the rectum. No bowel prep needed, and infection rates are lower.

Did you know?

Post-biopsy infection — including sepsis serious enough to need hospital admission — is reported more frequently after transrectal biopsies than after transperineal ones.

EAU and NICE guidance note that rising antibiotic resistance is changing which antibiotics are chosen for prophylaxis, and some centres now test for resistant bacteria before the biopsy to guide that choice.

Source: EAU Guidelines on Prostate Cancer 2024; NICE Diagnostics Guidance DG39

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Common questions

Frequently asked questions

Why am I being given antibiotics if there is no infection?

The biopsy needle passes through tissue that carries normal bacteria — the rectum in a transrectal approach, or skin in a transperineal one. Prophylactic antibiotics reduce the chance those bacteria cause an infection in the prostate or bloodstream. The specific antibiotic chosen depends on local resistance patterns, which urology teams review regularly. This is a precaution, not a sign that something is already wrong.

How far ahead do I need to stop blood thinners?

It depends on which medicine you take. Different drugs stay active in the body for different lengths of time, and the recommended pause varies accordingly. More importantly, whether to stop at all depends on why you are on the medicine — pausing a blood thinner can carry greater risk than the biopsy itself for some people. Contact your urologist's team at least a week before the procedure so there is time to plan this carefully. Do not stop anything on your own first.

Can I eat and drink normally before the biopsy?

Usually yes, if the biopsy is done under local anaesthetic. If sedation or general anaesthesia is planned, you will receive specific fasting instructions. Check the written preparation sheet from your team, because the answer depends on the type of anaesthesia being used, not on the biopsy itself. If you are unsure, call the clinic the day before to confirm.

What signs of infection should I watch for after the biopsy?

Watch for fever, shivering, or chills in the days after the biopsy. These can be early signs of a serious infection and need urgent medical attention — do not wait for your next appointment. Blood in the urine, stool, or semen is common for a week or two after a prostate biopsy and is not itself a sign of infection. If you develop a fever or feel seriously unwell, go to the nearest emergency department and tell them you recently had a prostate biopsy.

Does the biopsy route change what I need to prepare at home?

Yes. The main difference is bowel preparation: a transrectal biopsy usually needs an enema beforehand, while a transperineal biopsy does not. Both routes use antibiotic prophylaxis, though the antibiotic chosen may differ. Skin preparation for a transperineal biopsy is done at the clinic rather than at home. If you do not know which route your urologist is planning, ask before the day of your procedure — it determines what you need to do at home.

I take several medicines — which ones should I mention to my team?

Bring a complete list of everything you take: prescription medicines, over-the-counter medicines, vitamins, herbal supplements, and anything taken only occasionally. The medicines most likely to need adjustment are blood thinners and antiplatelets, but some supplements also affect bleeding. Rather than deciding what seems relevant yourself, hand the full list to your team and let them identify what to change. Do not assume a supplement is safe to continue just because it is available without a prescription.

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What Is a Biopsy?

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Types of Biopsy Compared

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Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

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Understanding Your Report

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IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

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How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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