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Pemfexy

Generic name: pemetrexed

Brand names: Alimta, Pemfexy

Last updated November 3, 2026 0 views
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What is Pemfexy?

Pemfexy is used in adults to treat a specific type of lung cancer that has come back or has spread to other areas of the body (metastatic).

Pemfexy is also used to treat a type of cancer that affects the lining of the lungs in adults who cannot have surgery.

Pemfexy may be used along with other cancer medicines.

Pemfexy may also be used for reasons not mentioned in this medication guide.

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Warnings

Use only as directed. Inform your doctor if you are using other medicines or have any other medical conditions or allergies.

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Before taking this medicine

You should not be treated with Pemfexy if you are allergic to it.

Tell your doctor if you have ever had:

  • bone marrow suppression;
  • radiation treatment; or
  • kidney disease.

Pemfexy can harm an unborn baby if either the mother or the father is using Pemfexy.

  • If you are a woman, you may need a pregnancy test to make sure you are not pregnant. Use birth control while using this medicine and for at least 6 months after your last dose. Tell your doctor if you become pregnant.
  • If you are a man, use birth control if your sex partner can get pregnant. Keep using birth control for at least 3 months after your last dose.
  • Tell your doctor right away if a pregnancy occurs.

It may be harder for you to get a woman pregnant while you are using this medicine. You should still use birth control to prevent pregnancy because the medicine can harm an unborn baby.

Do not breastfeed while using this medicine, and for at least 1 week after your last dose.

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Pemfexy side effects

Get emergency medical help if you have signs of an allergic reaction (hives, trouble breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning eyes, skin pain, red or purple skin rash with blistering and peeling).

Pemfexy may cause serious side effects. Call your doctor right away if you have:

  • kidney problems--swelling, urinating less, feeling tired or short of breath;
  • lung problems--new or worsening cough, trouble breathing;
  • low blood cell counts--fever, chills, tiredness, mouth sores, skin sores, easy bruising, unusual bleeding, pale skin, cold hands and feet, feeling light-headed or short of breath;
  • swelling, redness, or blistering of skin that was treated with radiation in the past; or
  • new signs of infection (fever, weakness, cough, diarrhea, burning when you urinate).

Your cancer treatments may be delayed or stopped permanently if you have certain side effects.

Common side effects of Pemfexy may include:

  • tiredness, feeling short of breath, cough;
  • swelling or sores in mouth, sore throat;
  • fever, rash;
  • low blood cell count;
  • loss of appetite; or
  • nausea, vomiting, diarrhea, constipation.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

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How is Pemfexy given?

Pemfexy is given as an infusion into a vein for 10 minutes. A healthcare provider will give you this injection.

Pemfexy is usually given once every 3 weeks. Your doctor will determine how long you should use this medicine.

You will be given other medications such as folic acid, vitamin B12, and a steroid to help prevent serious side effects. Keep taking these medicines for as long as your doctor has prescribed.

You may need frequent medical tests and your cancer treatments may be delayed based on the results.

Your blood pressure may get too low or you may get dehydrated during prolonged illness. Call your doctor if you are sick with vomiting or diarrhea.

What happens if I miss a dose?

Call your doctor for instructions if you miss an appointment for your Pemfexy.

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What happens if I overdose?

In a medical setting, an overdose would be treated quickly.

If you have kidney problems, do not take ibuprofen (Advil, Motrin) 2 days before, during, and 2 days after you are treated with Pemfexy.

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What other drugs will affect Pemfexy?

Pemfexy can damage your kidneys, especially if you are also taking certain pain or arthritis medications (like ibuprofen, Advil, Motrin, and Aleve).

Other drugs may interfere with Pemfexy, including both prescription and over-the-counter medicines, vitamins, and herbal products. Inform your doctor about all other medications you are taking.

This section was rewritten for readability and reviewed for meaning.

Common questions about Pemfexy

How does pemetrexed work?
Pemetrexed (brand names: Alimta, Pemfexy) is a chemotherapy medicine that enters fast‑growing cancer cells and blocks their ability to make new DNA, so the cells can no longer divide and many of them die. It does this by interfering with the way the body uses folate, a form of vitamin B, which cancer cells need to grow. Continue reading
Radiation vs. Chemo: Which cancer treatment is right for you?
Chemotherapy treats cancer throughout the body, while radiation targets specific areas. Each approach has unique benefits depending on the type and stage of cancer, as well as your overall health. Continue reading

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Before you take this medicine: the information on this page is general and may not cover your personal circumstances. Read the label supplied with your medicine and ask a pharmacist or doctor if you are unsure, especially if you are pregnant, breastfeeding, taking other medicines or managing a long-term condition.
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Content is provided for education and is not medical advice. See our medical disclaimer.