Mitomycin: what it treats, how to take it, side effects
Last updated September 7, 2026.
**Mitomycin is a chemotherapy medicine in the antitumor antibiotic class.** It damages cancer cell DNA, slowing cell growth. Especially when given into a vein, it can severely lower your blood counts, so specialist supervision and blood tests are essential.
What does it treat?
You may receive intravenous mitomycin with other chemotherapy for stomach or pancreatic cancer that has spread after other treatments have failed. Specialists also use it for other cancers, including anal cancer. Jelmyto treats low-grade cancer in the upper urinary tract. Zusduri treats recurrent low-grade, intermediate-risk bladder cancer that has not invaded bladder muscle. These are different formulations, not combination products; this page covers cancer treatment.
How do you take it?
A clinician gives mitomycin; you do not swallow it. The intravenous label lists 20 mg per square meter of body surface area once every 6 to 8 weeks after blood counts recover, with adjustments for toxicity. Jelmyto is placed into the kidney's collecting system weekly for six weeks, up to 60 mg in 15 mL per treatment; selected patients receive monthly maintenance. Zusduri is placed into your bladder through a catheter: 75 mg in 56 mL weekly for six weeks. There is no daily home dose or universal daily ceiling. Follow procedure instructions about food and fluids. Call to reschedule a missed appointment; never double treatment. Report fever, bleeding, or reduced urination before another dose.
Side effects to know
- Common: You may experience nausea, vomiting, mouth sores, appetite loss, fatigue, or hair loss with intravenous treatment; urinary formulations commonly cause painful urination or blood in your urine.
- Serious: Get immediate medical advice before further treatment for fever, unusual bleeding, new breathlessness, or burning and swelling around an intravenous injection site. Reduced urine, swelling, and marked weakness can signal hemolytic uremic syndrome, which damages blood cells and kidneys; Jelmyto can also block urine drainage.
Who should not take it?
Tell your specialist about allergies, kidney disease, low blood counts, bleeding disorders, and all medicines, including other chemotherapy. Intravenous mitomycin is contraindicated with low platelets or bleeding disorders. Urinary formulations must not be used through a perforated urinary tract, with restrictions specific to each product. Discuss pregnancy before treatment and do not breastfeed during treatment. Ask your team before drinking alcohol.
When is it an emergency?
For suspected overdose, call Poison Control at 1-800-222-1222 immediately, even without symptoms. Call 911 for collapse, breathing trouble, or throat swelling suggesting anaphylaxis. Seek emergency care for uncontrolled bleeding, fever with shaking chills, or inability to urinate with severe side or abdominal pain.
What a Pymander AI doctor consult looks like
Illustrative example, not a real member's messages.
Common questions
What is the maximum dose?
Your dose depends on the formulation. Intravenous doses above 20 mg per square meter increase toxicity without proven added benefit. Jelmyto is limited to 60 mg per instillation; Zusduri's recommended dose is 75 mg per instillation.
Can I drink alcohol?
The labels do not specify a safe alcohol allowance. Ask your specialist before drinking. Avoid alcohol when you have nausea, mouth sores, or dehydration.
What about pregnancy and breastfeeding?
Mitomycin can harm an unborn baby. For Jelmyto and Zusduri, use contraception during treatment and afterward for six months if you can become pregnant, or three months if your partner can. Do not breastfeed during treatment or for one week after either urinary product. Ask your oncologist about precautions after intravenous treatment.
Do I need food or special preparation?
Intravenous treatment generally does not require changing your usual diet. Follow any fasting instructions for anesthesia. Before Jelmyto, your team prescribes sodium bicarbonate to prepare your urine; follow their timing instructions exactly.
What are overdose signs?
Effects can be delayed. Fever, unusual bleeding, and reduced urination need urgent assessment. Call Poison Control at 1-800-222-1222 for suspected overdose without waiting for symptoms.
Which medicines need review?
Other chemotherapy can further suppress blood counts. Vinca alkaloids used with mitomycin can cause severe breathing reactions. For Jelmyto, your specialist may temporarily hold diuretics; do not stop them yourself.