What Happens During a Lu-177 PSMA Infusion? A Step-by-Step Guide for First-Time Patients

Why This Guide Exists

Finding out you need Lu-177 PSMA therapy raises a lot of questions. What will the room look like? Will it hurt? How long will you stay? What happens when you get home? Not knowing what to expect is often the hardest part.

This guide walks through every stage of a typical treatment day — from the checks your care team runs before the infusion to the simple rules you follow at home afterward. Every center runs things slightly differently, so always confirm details with your own team. The broad steps, though, are the same almost everywhere.

If you are still learning how this therapy works, the article What Is Lu-177 Therapy? A Patient-Friendly Guide to How It Works is a good place to start before reading this one.

A Quick Recap: What Is Lu-177 PSMA Therapy?

Prostate-specific membrane antigen (PSMA) is a protein found on the surface of nearly all prostate cancer cells. Lu-177 PSMA therapy attaches a radioactive particle — lutetium-177 — to a small molecule that seeks out that protein. Once it finds a PSMA-positive cancer cell, it delivers a focused dose of radiation right there, while largely sparing nearby healthy tissue.

In the landmark VISION trial, patients treated with Lu-177 PSMA-617 were approximately 40% less likely to die and 60% less likely to have disease progression on scans compared with patients on standard care alone. That trial helped lead to regulatory approvals in multiple countries.

Lu-177 PSMA therapy is given as a series of cycles, not a single treatment. Treatment is typically repeated every six weeks, with up to six cycles depending on disease response, blood results, kidney function, and physician discretion. This guide focuses on what happens at each individual visit.

Step 1: Confirming You Are a Candidate (Before Treatment Begins)

Before your first infusion is scheduled, your care team needs to confirm that your cancer is PSMA-positive. This matters because the therapy can only target cancer cells that actually carry the PSMA protein on their surface.

Before starting, the patient will undergo PSMA PET imaging to confirm that their prostate cancer cells express PSMA, which is necessary for the treatment to be effective. This scan is usually done weeks before the first infusion appointment.

Your team will also run blood tests to check your kidney function, liver function, and blood counts. These results show whether your body can handle treatment safely. If your numbers need time to improve, your care team may delay the cycle rather than cancel it.

You may also meet with a nuclear medicine specialist and a radiation safety officer. They will explain what to expect on treatment day and give you written instructions to take home.

Step 2: The Day Before Your Infusion

Most centers do not ask you to fast before a Lu-177 PSMA infusion, but always check with your team. Patients generally do not need to fast or do any other special preparations before receiving the treatment infusion.

A few practical things to sort out the day before:

• Arrange a driver. You should not drive yourself home after treatment because you will have low-level radioactivity in your body and may feel fatigued.
• Prepare your bathroom at home. You will be advised to flush the toilet twice after using it for the first few days post-treatment.
• Wash and set aside separate towels and bedding for the first two to three nights after treatment.
• Let family members know they may need to keep some distance from you for a few days — more on that below.

Step 3: Arriving at the Nuclear Medicine Unit

Lu-177 PSMA is given in a nuclear medicine suite, not a standard chemotherapy ward. The room looks a little different from a regular infusion room. The floor and chair are often lined with absorbent pads. This is normal and not a sign that something is wrong — it is standard radiation safety practice.

When you arrive, the team will:

• Check your identity and confirm your dose.
• Review your most recent blood test results.
• Place an intravenous (IV) line, usually in your arm.
• Give you anti-nausea medication through the IV before the infusion starts, to reduce the chance of feeling sick during or after treatment.
• Start a saline (salt water) drip to keep you hydrated throughout the session.

A nuclear medicine technologist or specialist physician will be with you for the infusion itself. You will not be alone.

Step 4: The Infusion Itself

The actual infusion of Lu-177 PSMA is straightforward. Lu-177 PSMA must be administered by slow intravenous infusion — it is not given as a fast bolus injection. The infusion usually runs for around 20 to 30 minutes, though your total time at the clinic is longer because of the pre-treatment steps and monitoring afterward.

The drug arrives in a shielded container to protect staff during handling. Once connected to your IV line, it flows slowly into your bloodstream. You will not feel the radiation working. Most patients say the infusion feels no different from any other IV drip.

After the Lu-177 PSMA has been given, the IV line is flushed with saline to make sure all of the dose has been delivered and none is left in the tubing.

Some patients feel mild nausea, a headache, or notice a temporary change in taste or smell during the infusion. These effects are usually short-lived. Tell the nurse right away if anything feels unusual so they can adjust your anti-nausea support.

Step 5: Monitoring After the Infusion

A nuclear medicine technologist will monitor the level of radiation from you after the infusion procedure is completed at different intervals. You may be required to remain in the suite for an estimated six to eight hours throughout the therapy session.

During this observation window, the team:

• Measures the radiation coming from your body at set time points to make sure it is dropping as expected.
• Checks your blood pressure, heart rate, and how you are feeling overall.
• Encourages you to drink plenty of fluids and use the bathroom regularly.

Drinking a lot of water is not just about comfort. Doing so helps reduce radiation retention in the bladder and facilitates elimination of the radiopharmaceutical from the body. Your team may set a fluid target before you leave.

Many centers also schedule a full-body scan — called a SPECT/CT or scintigraphy scan — for the day after your infusion. This scan is not to check for side effects. It maps where the Lu-177 has traveled in your body, confirming it has reached the tumors and giving the team useful information for your next cycle.

Step 6: Going Home — Radiation Safety Rules

Most patients go home the same day or the following day after their infusion. Universal precautions are typically advised for the first three days after infusion because a small amount of radioactive material is still clearing from your body during that time.

Your care team will give you a written radiation safety card. Keep it with you. If you need to go to an emergency room in the days after treatment, show the card to staff so they know how to handle your care safely.

Standard precautions during those first few days include:

• Distance from others: Avoid close contact with others — especially children and pregnant women — for approximately three to seven days after each infusion.
• Sleeping arrangements: Sleep alone or keep a gap of about one metre from a partner for the first few nights.
• Bathroom habits: Sit down when using the toilet to reduce splashing. Flush twice. Wash your hands thoroughly afterward.
• Laundry: Wash your clothes and bedding separately from those of other household members for the first two to three days.
• Public transport: Avoid crowded buses, trains, and flights for the first few days if you can.

For more detail on radiation safety at home — including a common question about hugging grandchildren — see our dedicated guide: Can I Hug My Grandchildren After a Lutetium Infusion?

These precautions may sound significant, but Lu-177 emits beta and low-energy gamma particles and has a half-life of approximately 6.7 days, meaning the activity in your body halves roughly every week. By the time your next cycle comes around, the radioactivity from the previous cycle has dropped to a very low level.

Step 7: The Days After Treatment

You may feel more tired than usual for a few days after the infusion. Fatigue is one of the more common effects. Rest when you need to. Light activity such as short walks is generally fine, but avoid strenuous exercise in the first 24 hours.

Side effects to watch for in the first week include:

• Nausea or reduced appetite (usually mild and short-lived)
• Dry mouth — caused by low-level PSMA expression in the salivary glands
• Fatigue
• Bone pain that temporarily feels worse before improving

If you develop a fever, unusual bruising, or notice that your urine looks very dark or red, contact your care team promptly. These may be signs that your blood counts need checking.

Your team will schedule a blood test roughly two to four weeks after each cycle. These results guide decisions about your next cycle — whether to proceed on schedule, adjust timing, or make other changes to your care plan.

Step 8: Preparing for the Next Cycle

If your blood results and overall condition allow, your next infusion will be scheduled six weeks after the previous one. The same steps repeat: blood tests, IV placement, anti-nausea premedication, saline hydration, infusion, monitoring, and home precautions.

Each cycle, your team will review how your body is responding. They may check PSA levels, look at imaging, and assess how you are feeling day to day. It is worth knowing that PSA levels sometimes rise in the first weeks after starting treatment before they begin to fall. This is not unusual. Meaningful assessment of response on PSMA PET imaging should generally be expected no earlier than 12 weeks after the first infusion. Discuss any concerns about your results directly with your oncologist rather than comparing numbers to other patients online.

What About Patients Travelling to India for Treatment?

A growing number of patients from around the world are choosing India for their Lu-177 PSMA cycles because of availability, expertise, and cost. The treatment steps in this guide apply regardless of where you receive care — the infusion protocol, monitoring standards, and radiation safety precautions follow international nuclear medicine guidelines. If you are considering this route, the article Why India Is Becoming the World's Destination for Lutetium Therapy covers what to expect as an international patient.

What About Side Effects Across Multiple Cycles?

Side effects can build slightly over repeated cycles, particularly fatigue and effects on blood counts. The kidneys and bone marrow are the main organs your team monitors across cycles, using regular blood and urine tests to catch any concerns early. For practical advice on managing tiredness during a similar radioligand therapy, our article on Managing Fatigue During Lu-177 DOTATATE Therapy covers strategies that also apply here, such as pacing activity, prioritising sleep, and keeping your care team informed about your energy levels.

When to Talk to Your Doctor

Contact your oncology or nuclear medicine team promptly if you experience fever, chills, unusual bleeding or bruising, severe nausea or vomiting that does not settle, significant bone pain that is new or worsening, or any symptoms your team did not warn you about. Between cycles, keep all scheduled blood test appointments even if you feel well — these tests catch problems before they become serious.

This article is for general information and is not a substitute for medical advice. Always consult your oncologist or care team about your specific situation.