Before your biopsy

Antibiotics Before a Biopsy: — When Are They Given?

Not every biopsy requires an antibiotic beforehand. The ones that do are those where the needle passes through an area that cannot be fully sterilised — and knowing which yours is helps you prepare.

Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026

Not always needed — Most biopsies go through the skin under sterile conditions and do not routinely need antibiotic cover.
Prostate is the main one — Transrectal prostate biopsies pass through the rectal wall, where bacteria are always present.
Tell your team about allergies — Alternatives can be found — but only if your team knows before the day of the procedure.
Medicines matter too — Blood thinners and some other medicines interact with pre-biopsy antibiotics. Bring a full list.

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Not every biopsy needs an antibiotic beforehand. Transrectal prostate biopsies and certain GI procedures carry a higher infection risk because the needle passes through a non-sterile area. Your team gives antibiotic cover before those procedures. Tell them about any allergy before the day of your biopsy.

If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.

Which biopsies need antibiotic cover, and why?

The transrectal prostate biopsy is the procedure most commonly given antibiotic cover. The needle takes each sample by passing through the wall of the rectum, which always contains bacteria. Without an antibiotic given beforehand, those bacteria can enter the bloodstream.

Some GI procedures also carry a higher infection risk, depending on where in the gut the sample is taken and how the scope reaches it. Your gastroenterologist will decide whether cover is needed for your specific procedure.

Biopsies done through the skin — such as ultrasound or CT-guided sampling of the liver, lung, or soft tissue — are performed under sterile conditions. They do not routinely require antibiotic prophylaxis, because the needle does not pass through a contaminated area.

Which biopsy is yours, and what does that mean for antibiotics?

Biopsy type	Route	Antibiotic cover
Transrectal prostate biopsy	Through the rectal wall	Usually given — recommended in urology guidelines
Transperineal prostate biopsy	Through the skin of the perineum	Lower infection risk than transrectal — your team decides
Endoscopic GI biopsy	Through the scope in the gut	Depends on the specific procedure — your team decides
Image-guided core biopsy (liver, lung, soft tissue)	Through the skin, sterile field	Not routinely required
Typically: if infection develops	In the days after the procedure	Fever or chills: go to emergency. Burning urine or worsening pain: call your team same day.

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Tell your team this before your biopsy

Any antibiotic allergy — and what reaction you had. A rash is different from a serious reaction, and your team needs to know which.
All medicines you currently take, including herbal, Ayurvedic, and over-the-counter preparations.
Blood thinners or aspirin. You may be asked to pause these before the procedure.
Any recent infection, fever, or dental procedure.
Whether you have diabetes or a condition that affects your immune system.

Questions you may have before the day

What if I am allergic to the antibiotic they want to give me?

Tell your team as soon as you know your biopsy is planned — not on the day itself. There are different categories of antibiotic, and when one is not suitable, an alternative from a different category can be prescribed. What matters is that your team has enough notice to arrange it. Describe the reaction you had, not just the name of the medicine, because the severity of the reaction affects what they choose next.

When is the antibiotic given — before I arrive or on the day?

This varies by centre and by the category of antibiotic used. Some are given as an injection on arrival at the procedure unit. Others are prescribed as tablets to take the night before or the morning of the biopsy. Your team will give you specific instructions. Follow those, and call the clinic if anything is unclear before the day.

Can I eat and drink normally before taking the antibiotic?

Follow the preparation instructions your team gives you — those cover the whole of your pre-procedure routine, including any medicine you take that morning. If you were prescribed a tablet, your team will tell you whether to take it with water only or with food. Ask when the prescription is given so you are clear before the morning of the procedure.

What if I forgot to take the antibiotic before coming?

Tell the team when you arrive — do not stay silent. In many cases, cover can still be given on arrival before the procedure begins. The team will decide whether to proceed, give it a different way, or reschedule. Concealing a missed dose does not help and increases your risk of infection.

Will I need antibiotics after the biopsy as well?

Sometimes, yes. For higher-risk procedures, a short course to take at home may be prescribed alongside the pre-procedure dose. Your team will tell you at discharge. If you develop burning when passing urine or notice any worsening symptom, call your team the same day. If you have a fever or shaking chills, go to the emergency department — do not wait for a callback.

Did you know?

Transrectal prostate biopsy carries a higher infection risk than most other cancer diagnostic procedures, because every sample passes the needle through the rectal wall — an area that cannot be sterilised.

Antibiotic prophylaxis before the procedure substantially reduces this risk, which is why the European Association of Urology recommends it as standard practice before transrectal sampling.

Source: European Association of Urology (EAU) Guidelines on Prostate Cancer Diagnosis and Early Detection

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Common questions

Frequently asked questions

Do I need an antibiotic before a liver biopsy?

Not routinely. Liver biopsies are usually done through the skin under sterile conditions, and the infection risk from the procedure itself is low. Antibiotic prophylaxis is not standard for most image-guided core biopsies. If something specific about your situation changes this — for example, a compromised immune system or a pre-existing liver infection — your team will tell you and give instructions accordingly.

What is the difference between a transrectal and transperineal prostate biopsy?

A transrectal biopsy passes the needle through the rectal wall to reach the prostate. A transperineal biopsy passes through the skin of the perineum — the area between the anus and the scrotum — which can be prepared as a sterile field. The transperineal route carries a lower infection risk, and many centres now prefer it partly for that reason. Your urologist will explain which is planned for you and what pre-procedure preparation is needed.

I am already taking an antibiotic for a different reason. Does that cover my biopsy?

Not necessarily. The antibiotic cover used before a transrectal biopsy targets specific bacteria found in the rectum. A course you are taking for a different infection may use a different category or strength than what is needed. Tell your team what you are taking and why, and let them decide whether your current course is adequate for biopsy prophylaxis. Do not assume it covers you without asking.

Can herbal or traditional medicines replace antibiotics before a biopsy?

No. There are no herbal or traditional preparations with evidence to replace prescription antibiotic prophylaxis before a transrectal biopsy. If you use herbal, Ayurvedic, or over-the-counter preparations regularly, tell your team before the day — not because they will judge this, but because some preparations interact with antibiotics or affect bleeding. Your team needs to know what you are taking to plan safely.

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

Some blood in the urine or stool in the days after a prostate biopsy is common and expected. What is not normal is fever, shaking chills, burning when passing urine that worsens, or feeling very unwell. Call your team the same day any of these appear. If you have a fever or shaking chills, go to the emergency department rather than waiting — these can be early signs of a bloodstream infection that needs prompt treatment.

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