5-FU Infusion Pump Errors: When Chemotherapy Is Delivered Too Fast

If you or someone you love is on chemotherapy for colon/rectal, stomach, pancreatic, or breast cancer, there’s a good chance 5-fluorouracil (5-FU) is part of the plan. It’s one of the most widely used cancer drugs in the world, and with 5-FU, the speed of delivery matters as much as the dose.

Most people never think twice about the small pump clipped to their belt for two days. But that pump is doing the most important job in the treatment.

When it fails, or is set up wrong, the result can be a serious overdose. This article explains how 5-FU pump errors happen, what the warning signs look like, the emergency treatment that exists, and your legal options in New York.

How a 5-FU Pump Works

5-FU is a fluoropyrimidine. It interferes with how cancer cells copy their DNA, and it’s a core ingredient in regimens like FOLFOX, FOLFIRI, and FOLFIRINOX, which are common in colon and rectal cancer treatment.

In many of these regimens, part of the dose is given quickly at the infusion center. The rest runs as a continuous infusion over about 46 hours. A nurse connects a bag or cartridge of 5-FU to a portable pump that feeds the drug through a port or PICC line, and you go home with it running. A few days later, you return to have it disconnected.

Chemotherapy has a narrow margin between a helpful dose and a harmful one. Spreading the dose over two days keeps blood levels manageable. Delivering the same amount in a few hours can overwhelm the body’s ability to clear it. With 5-FU, the pump isn’t just a delivery tool.

It’s a safety device. Our page on cancer treatments gives broader background on chemotherapy.

What Happens When 5-FU Runs Too Fast

When a pump meant to run for about 46 hours empties in a few, the body takes in most of the dose at once. Effects can appear within hours or build over days:

• Severe mouth and throat sores (mucositis)

• Intense nausea, vomiting, and diarrhea leading to dehydration

• A dangerous drop in white blood cells, leaving the patient open to life-threatening infection

• Hand-foot syndrome, with painful redness and peeling

• Chest pain or abnormal heart rhythms

• Confusion or balance problems

In the worst cases, a 5-FU overdose is fatal. Chemotherapy pump errors are a recognized medication safety problem, not a theoretical one.

How 5-FU Pump Errors Happen

There’s rarely a single cause. Which category the failure falls into shapes who may be responsible.

• Programming errors. Many electronic pumps are set by hand with a rate, volume, and duration. A wrong number, a misplaced decimal, or a mix-up between units can send the drug in far too fast. Programming a 46-hour infusion as a 4-hour infusion can be catastrophic.

• Ordering and transcription errors. A prescriber might confuse the bolus with the continuous infusion, or a per-square-meter dose with a total daily dose. Everyone downstream may then faithfully carry out a flawed order.

• Pharmacy compounding errors. If the concentration or volume in the bag is wrong, a perfectly programmed pump can still deliver a dangerous amount.

• Device malfunction or design. A software glitch or mechanical failure can make a pump run faster than set. A confusing interface that invites mistakes can be a legal issue in its own right.

• Tubing and cartridge problems. If a clamp that prevents uncontrolled flow doesn’t engage, or an incompatible set is used, the drug can free-flow into the line.

• Connection and teaching failures. A misclamped line or a mix-up with the wrong pump can change what’s delivered. So can sending a patient home without explaining the alarms, what an early-empty pump looks like, or who to call at night.

Not Every Severe Reaction Is a Pump Error

Some people carry variants in the DPYD gene that leave them unable to break down 5-FU properly. This is called DPD deficiency. These patients can suffer severe or fatal toxicity from a correct dose delivered correctly.

On March 21, 2024, the FDA approved safety labeling changes for fluorouracil injection products to strengthen warnings about this risk. How routinely U.S. providers should test for it before treatment is still evolving.

If the pump worked and the dose was right, the question may become whether the provider should have discussed or tested for DPD deficiency, or recognized and treated the toxicity fast enough.

That can be a valid claim in some situations, but it isn’t a pump error. Don’t assume the cause until the records and an expert have been reviewed.

Can You Sue After a 5-FU Pump Error in New York?

You may be able to, if negligence or a defective product caused real harm. A malpractice claim requires showing that a provider departed from accepted practice and that the departure was a substantial factor in causing injury.

A programming mistake that delivers 46 hours of chemotherapy in a few hours is a strong example of a departure, but each case turns on its facts. These cases need expert testimony, and a complaint must be filed with a certificate of merit.

New York doesn’t cap pain-and-suffering damages in most malpractice cases. It follows pure comparative fault, so a patient who was partly responsible has recovery reduced, not barred. In most pump-error cases, the patient did nothing wrong.

Filing Deadlines in New York

The deadline depends on who you’re suing. When several could apply, the earliest one controls.

• Medical malpractice. Under CPLR 214-a, the deadline is generally two years and six months from the negligent act, or from the end of continuous treatment for the same condition. Lavern’s Law, the special rule for missed cancer diagnoses, generally doesn’t apply to a treatment error like this.

• Product liability against a pump manufacturer. Under CPLR 214, the deadline is generally three years from the injury.

• Wrongful death. Under EPTL 5-4.1, the estate’s personal representative generally must file within two years of the death. A related survival claim covers what the person endured before death.

• Public hospitals. Facilities such as NYC Health + Hospitals generally require a notice of claim within 90 days. Claims against the State go through the Court of Claims, which has its own notice rules.

Ninety days passes quickly during a medical crisis, which is why speaking with a lawyer early matters.

Evidence to Preserve

Evidence in pump cases can disappear fast.

• Keep the pump if you safely can. Many pumps store a history of what was programmed, what was delivered, and any alarms. That record can show the gap between the intended rate and the actual rate.

• Ask in writing for the pump to be preserved. Consider having an attorney send formal preservation letters to the facility and the manufacturer.

• Keep the tubing, cartridge or bag, and any leftover medication. Photograph everything, including lot numbers.

• Request your full chart. Under Public Health Law § 18, you can get:

  • orders

  • pharmacy compounding records

  • the medication administration record

  • documentation of any independent double-checks

  • pump-teaching instructions

  • after-hours call logs

  • labs and admission records

  • any notes on uridine triacetate or DPD testing

• Keep your own diary. Note when the pump seemed to finish, when symptoms started, who you called, and what you were told. Photograph mouth sores, skin changes, and the pump display.

Some hospital quality-assurance and incident materials are confidential under New York law. New York hospitals must also report certain serious adverse events to the state through a system called NYPORTS. You can file complaints against licensed nurses, pharmacists, or physicians. Those processes can lead to discipline, but they don’t compensate you and aren’t a substitute for a claim.

Talk With a New York Cancer Lawyer

If you suspect a pump error harmed you or a loved one, get the medical care you need first. Then preserve what you can, request the records, and talk to a lawyer before the deadlines close in.

Porter Law Group represents patients and families across New York, with offices in Albany, Buffalo, New York City, Rochester, and Syracuse.

Our New York cancer lawyers work with oncology, pharmacy, and device experts to find out where the process failed. You can also see our results in cancer cases.

Call 833-888-LATE, email info@porterlawteam.com, or request a free case evaluation.

Attorney advertising. This article provides general information and is not legal or medical advice. If you feel seriously unwell during chemotherapy, call 911. Prior results do not guarantee a similar outcome. Filing deadlines depend on the facts of each case.

Frequently Asked Questions

What happens if a 5-FU chemotherapy pump runs too fast?

A 5-FU pump is designed to deliver the drug over about 46 hours. If it empties in a few hours, the body takes in most of the dose at once. That can cause severe mouth sores, vomiting and diarrhea, dangerously low white blood cells, heart rhythm problems, confusion, and in the worst cases death. It’s a medical emergency.

How can I tell if my chemo pump is running too fast?

Warning signs include a reservoir that looks empty well before your scheduled disconnect, unexpected alarms or error messages, and fluid leaking from the line. Severe mouth sores, uncontrolled vomiting or diarrhea, fever, chest pain, or confusion are also red flags. Call your oncology team right away, or 911 if you feel seriously unwell.

Is there an antidote for a 5-FU overdose?

Yes. Uridine triacetate (Vistogard) is FDA-approved for any fluorouracil or capecitabine overdose, regardless of symptoms. It’s also approved for early-onset severe toxicity within 96 hours after the 5-FU infusion ends. It works only if given promptly, so a delay in recognizing an overdose can rule it out.

Is every severe reaction to 5-FU caused by a medical error?

No. People with DPD deficiency, caused by variants in the DPYD gene, can’t break down 5-FU normally and can have severe or fatal reactions to a correct dose. The FDA strengthened fluorouracil’s DPD warnings in March 2024. A DPD-related case raises different legal questions than a pump that delivered the drug too fast.

Can I sue for a chemotherapy pump error in New York?

You may be able to sue the nurse, facility, prescriber, or pharmacy for malpractice, or the manufacturer if the pump was defective. Malpractice claims generally must be filed within two and a half years, and product claims within three. Public hospital claims require a notice of claim within 90 days, so speak with a lawyer quickly.