Updated March 27, 2026

An intrathecal pump, also known as a pain pump or implanted intrathecal drug delivery system (IDDS), is a surgically implanted device that delivers medication directly to the fluid surrounding the spinal cord. This guide is developed by Eellan Sivanesan, M.D., associate professor and director of neuromodulation in the Division of Pain Medicine at Johns Hopkins, whose clinical and research work focuses on advanced implantable pain therapies and mechanism-informed neuromodulation. Dr. Sivanesan provides expert insight into how intrathecal pumps work and what patients can expect before, during and after implantation.

What is a pain pump?

A pain pump, also called an intrathecal drug delivery system, is a small device that is surgically implanted to deliver medication directly to the fluid surrounding the spinal cord (the intrathecal space). The system consists of a programmable pump and a medication reservoir placed under the skin of the abdomen (belly), along with a thin catheter that delivers medication to the spinal cord.

The intrathecal space, sometimes called the subarachnoid space, contains cerebrospinal fluid and surrounds the spinal cord and nerve roots. This fluid bathes and protects the nervous system, and allows medication delivered by the pump to act directly on the spinal cord to reduce pain signals.

What are the benefits of an intrathecal pump compared to other types of medication delivery?

Delivering medication directly into the spinal fluid has several advantages compared with medications taken by mouth or through a vein:

• Precision: Medication is delivered directly to the spinal cord, where pain and spasticity signals are processed. This allows the medication to act more precisely on pain pathways.
• Lower doses: Because the medication is delivered directly to the spinal fluid, symptom control can often be achieved with much lower doses than medications taken by mouth (oral) or through a vein. In some cases, the intrathecal dose may be less than 1% of the equivalent oral dose.
• Reduced side effects: Targeted delivery reduces exposure of the rest of the body to the medication, which may lower the risk of side effects associated with long-term use of systemic medications – those that spread through the whole body.
• Improved pain control in selected patients: Clinical studies in patients with cancer-related pain and pain associated with advanced illness have shown that intrathecal therapy can provide improved pain control and may be better tolerated than medications taken by mouth.

How does a pain pump work?

An intrathecal pain pump system is implanted through a minimally invasive surgical procedure and consists of several components that work together to deliver medications.

The primary components include:

• A thin, flexible tube called a catheter is inserted in the intrathecal space surrounding the spinal cord. This catheter delivers medication into the spinal fluid.
• An extension catheter attaches to the catheter in the intrathecal space and goes around the torso.
• Implantable pump: The pump is a small, round device, typically about 1-inch thick and several inches in diameter, that is implanted beneath the skin of the abdomen. It is programmable and delivers precise, measured doses of medication into the intrathecal space on a customized schedule. The pump has a refillable reservoir that stores the medication. When the medication level becomes low, the reservoir can be refilled in the clinic using a sterile needle through the skin.
• Personal therapy manager (PTM): Some pain pump systems include a handheld device that allows patients to release limited additional doses of medication within physician-programmed safety limits. The PTM is preset by the care team to ensure safe use and prevent overdose.

Once implanted, the pump continuously delivers small amounts of medication from the reservoir through the catheter and into the spinal fluid. This targeted delivery allows medication to act directly on pain and spasticity pathways in the nervous system, providing consistent symptom control without affecting the entire body.

The dosing schedule and settings are tailored to each patient and can be adjusted during follow-up visits to optimize symptom relief and minimize side effects.

What medications are used in an intrathecal pump?

Intrathecal pumps can deliver several types of medications, including:

• Opioids, such as morphine or hydromorphone, which reduce pain signaling within the spinal cord
• Local anesthetics, which help block nerve transmission
• Baclofen, which is used to treat spasticity and muscle stiffness
• Clonidine, which can enhance pain control by modifying nerve activity
• Ziconotide, a non-opioid medication derived from marine peptides, that targets specific pain pathways

In many cases, combinations of medications are used to improve effectiveness while minimizing side effects. The specific drug protocol is carefully selected and adjusted based on each person’s condition, response to therapy and tolerance.

Can a pain pump be removed?

An intrathecal pain pump can be removed if medically necessary, such as in the case of infection, device malfunction or serious complications. In most cases, concerns related to pain control, side effects or reduced effectiveness can be addressed by adjusting medications, changing programming or adding supportive therapies. Many people benefit from ongoing optimization of their pump therapy.

Before considering removal, work closely with your care team to explore all reasonable options to improve comfort and function. With appropriate follow-up and maintenance, most intrathecal pump systems can provide lasting symptom relief for many years. Removal is usually considered only after alternatives have been carefully evaluated.

What conditions can be treated by an intrathecal pump?

An intrathecal pump may be recommended for some people with severe, persistent pain or spasticity (muscle stiffening or spasms) that has not responded well to other treatments.

Most common conditions that can be treated with an intrathecal pump include:

• Cancer pain, stemming from either cancer itself or treatments such as chemotherapy
• Spasticity due to stroke, multiple sclerosis, cerebral palsy or brain or spinal cord injury

In some cases, intrathecal therapy may be considered for other severe chronic pain conditions when less invasive treatments have not provided sufficient symptom relief. These conditions may include:

• Back or neck pain, including from compression fractures, disk pain, spinal stenosis or spondylosis
• Pain that lingers after past surgeries
• Abdominal or pelvic pain
• Pain in the limbs
• Complex regional pain syndrome
• Trunk pain, including postherpetic neuralgia (chronic pain that lingers after a shingles infection)
• Peripheral nerve injury pain
• Other nerve-related pain

Who is a candidate for an intrathecal pump?

A pump may be appropriate for a person experiencing severe, long-term pain or spasticity that has not been relieved through other approaches such as pills, physical therapy or relaxation techniques.

A pain specialist will help you decide if a pain pump is a good option by asking questions about your pain, what makes it better or worse, what you have tried in the past and the impact of the pain on your life and well-being.

In general, an intrathecal pump is most likely to be recommended for people who:

• Have tried other methods of pain control, including multiple opioid pain medications, physical therapy, relaxation techniques and others
• Need pain or spasticity medicine around the clock
• Expect to live longer than six months
• Do not have a substance use disorder, increased intracranial pressure or certain psychiatric illnesses that may complicate pain treatment

Careful patient selection and ongoing follow-up are essential to maximize treatment effectiveness and minimize risks. For appropriate candidates, intrathecal pump therapy can provide durable, targeted symptom relief while reducing the effects on the rest of the body.

Intrathecal Pump Trial

Because each person’s response to medication is different, the intrathecal pump may not work for everyone. To help you and your doctor decide, you may undergo a trial of medication infused into the intrathecal area to see if it provides relief. Trials are rarely performed for chronic cancer pain, but are more common for pumps to treat spasticity. In most cases, intrathecal pumps for cancer-related pain are placed without a trial phase.

There are different ways to perform the trial:

• One dose of medication placed into the intrathecal space with a lumbar puncture.
• Multiple doses, using lumbar puncture with or without a catheter, are placed in the intrathecal space.
• A continuous trial, in which a catheter is placed in the intrathecal space and connected to a pump that is not implanted in the body.

The trial may also help the doctor find the best place to implant the catheter and narrow down the medication that works best to relieve your symptoms.

Pain Pump Surgery

The procedure is performed by an interventional pain specialist and takes two or three hours. Patients can go home the same day or after a short hospital stay, depending on personal circumstances.

Preparing for the Pain Pump Procedure

• Once you and your pain specialist have determined that a pain pump is a good option for you, your surgery will be scheduled.
• Before the procedure, you may have some tests, such as a blood test and an electrocardiogram to ensure you are healthy enough to have the procedure.
• You will be advised not to eat or drink anything after midnight before the surgery.
• Ask your doctor if and how you should take your medications the morning of your procedure.

What Happens During Pain Pump Implantation

Intrathecal pump implantation is performed in a specialized surgical setting and is designed to be safe, precise and minimally invasive. Before the procedure, an intravenous line is placed, and you will receive anesthesia to keep you comfortable and asleep during surgery.

During the procedure:

• The surgery team prepares and cleans the areas of the lower back and abdomen where the device components will be placed.

• A small incision is made in the lower back to allow access to the spine.
• A thin catheter is carefully inserted into the intrathecal space, where medication will be delivered.
• The catheter is secured in place to reduce the risk of movement.
• A second incision is made in the abdomen to create a pocket beneath the skin for the pump.
• An extension catheter is tunneled under the skin to connect the spinal catheter to the pump.
• The pump is placed into the abdominal pocket and connected to the catheter system.
• In some cases, the pump is secured to underlying tissue to enhance long-term stability.
• Both incisions are closed and covered with sterile dressings.

Recovering from Intrathecal Pump Surgery

Leaving the Hospital

Patients can usually go home after a few hours of observation in the recovery room. Before you leave, your care team will make sure:

• Your vitals, including heart rate and blood pressure, have returned to normal and are steady.
• The pump is programmed to deliver the right combination of drugs according to the set schedule.
• You have received detailed instructions for recovery and follow-up care, including:
  • Wound care, dressing removal and when it is safe to shower
  • Activity restrictions

Early Recovery

During the early recovery period:

• Mild swelling, bruising or discomfort at one or both incision sites is common for several days.
• You may wear a compression brace (abdominal binder) to support the pump site and promote proper healing.

Follow-up Care and Return to Activity

Patients typically have a follow-up visit one to two weeks after surgery so the care team can evaluate incision healing and adjust therapy if needed.

For the first four to six weeks after implantation, patients are generally advised to:

• Not lift anything heavy (10 pounds or more).
• Not twist the torso or bend at the waist to pick up anything from the floor.
• Avoid extreme temperatures such as hot tubs, ice baths or saunas.

Gradual return to normal activity is encouraged as healing progresses. Your doctor will guide you on when it is safe to resume work, exercise and other daily activities.

Intrathecal Pump Side Effects and Complications

Intrathecal pump therapy is generally considered safe when performed among patients who meet the criteria and when managed by experienced specialists. As with any implantable devices, there are potential risks.

Although uncommon, possible side effects or complications may include:

• Infection
• Cerebrospinal fluid leak, which may cause headaches and is usually treatable
• Device-related issues, such as catheter kinking, blockage, pump malfunction, or shifting of the device, which may sometimes need reprogramming or revision surgery.
• Medication-related side effects, which vary based on the drug and can include drowsiness, nausea, itching, inability to fully or partially empty the bladder or muscle weakness.

Serious complications are rare, and most issues can be quickly evaluated and successfully treated. Careful surgical technique, tailored medication dosing, regular follow-ups and scheduled pump refills all help reduce risks and keep the therapy safe.

Contact your care team right away if you experience new neurological symptoms, fever, increasing pain at the surgical site, sudden changes in symptom control or concerns about pump function.

Living with an Intrathecal Pump

A pain pump should ease your pain and help you get back to some of your regular activities. Here are answers to common questions about day-to-day function with an intrathecal pump:

How is an intrathecal pump refilled?

Every one to three months, you will return to your pain doctor to have the pump refilled with medication. Sometimes these refills can be performed at home through a skilled nursing service under the guidance of a physician. To refill a pump, a needle is inserted through the skin into the pump’s reservoir refill port. Any remaining medicine from the pump is removed and new medicine is injected.

What happens if my pain or spasticity gets worse?

If your symptoms worsen, call your doctor, who can troubleshoot the pump and adjust settings if needed. Your doctor will first check whether the pump is malfunctioning. If it is working as programmed, the doctor may adjust the type of medication, doses or timing of delivery. You may be prescribed medicine in pill form for times when the pain and/or spasticity gets worse.

Will my intrathecal pump set off metal detectors?

Yes, an implanted intrathecal pump may be detected by airport security systems or other metal detectors. After your procedure, you will receive a device identification card that confirms you have an implanted medical device. Always carry this card with you, and present it to security personnel when passing through metal detectors.

How long does an intrathecal pump last?

The battery of the pump is designed to last five to seven years. Your doctor will check battery health during refill appointments. The pumps are designed to provide an early warning to allow for sufficient time to perform a replacement before the pump stops working. This helps ensure uninterrupted therapy and continued symptom control.

Can I have an MRI with an intrathecal pump?

If you have an MRI test done, notify the doctor ordering the test and the technologist performing the MRI that you have a pain pump implanted. While the imaging is taking place, the pain pump will stop working and may alert you with an alarm. It will start working again after the test is over; however, a device representative or physician will need to double check that the pump is working as programmed after the MRI.

When should I call my doctor?

Contact your doctor promptly if your pump emits an alarm or if you experience new or worsening symptoms.

You should also call your care team if you notice:

• Increasing or uncontrolled pain
• Redness, swelling, warmth, or drainage near the pump or incision sites
• Fever or chills
• Increasing nausea, fatigue, weakness, dizziness or numbness
• New muscle stiffness of spasms
• Sudden changes in symptom control

These symptoms could point to a medication issue, pump or catheter problem or an infection. Early evaluation helps prevent serious complications. If you experience severe symptoms such as difficulty breathing, sudden confusion, severe weakness or signs of medication overdose or withdrawal, seek emergency medical care immediately.

Medically reviewed by Eellan Sivanesan, M.D.