Alimta Side Effects

Nausea, vomiting, loss of appetite, diarrhea, stomach upset, changes in taste, constipation, mouth sores, and tiredness may occur. Nausea, vomiting, and diarrhea can be severe. In some cases, your doctor may prescribe medication to prevent or relieve nausea, vomiting, and diarrhea. Eating several small meals, not eating before treatment, or limiting activity may help lessen nausea and vomiting. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Temporary hair loss may occur. Normal hair growth should return after treatment has ended.

People using this medication may have serious side effects. However, your doctor has prescribed this drug because he or she has judged that the benefit to you is greater than the risk of side effects. Careful monitoring by your doctor may decrease your risk.

Tell your doctor right away if you have any serious side effects, including: numbness/tingling skin, swelling ankles/feet/hands, signs of kidney problems (such as change in the amount of urine), signs of liver disease (such as nausea/vomiting that doesn't stop, stomach/abdominal pain, yellowing eyes/skin, dark urine).

This medication may decrease bone marrow function, an effect that may lead to a low number of blood cells such as red cells, white cells, and platelets. This effect can cause anemia, decrease your body's ability to fight an infection, or cause easy bruising/bleeding. Tell your doctor right away if you develop any of the following symptoms: unusual tiredness, pale skin, signs of infection (such as sore throat that doesn't go away, fever, chills), easy bruising/bleeding.

Get medical help right away if you have any very serious side effects, including: blisters or sores, signs of lung problems (such as new or worsening shortness of breath, cough).

Pemetrexed may cause a serious skin reaction that looks like a severe sunburn (radiation recall) on any area that has been treated with radiation weeks to years before. Get medical help right away if you have skin redness, pain, tenderness, swelling, peeling, or blisters.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

Pemetrexed can commonly cause a rash that is usually not serious and that can be prevented by taking corticosteroid medication (see How to Use section). However, you may not be able to tell the rash apart from a rare rash that could be a sign of a severe reaction. Get medical help right away if you develop any rash.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
  • infection
  • dehydration
  • autoimmune hemolytic anemia
  • anemia
  • thrombocytopenic disorder
  • leukopenia
  • neutropenic disorder
  • depression
  • peripheral motor neuropathy
  • conjunctivitis
  • eye tearing
  • hypertension
  • pulmonary thromboembolism
  • ventricular tachycardia
  • cardiac arrhythmia
  • supraventricular arrhythmias
  • thromboembolic disorder
  • pharyngitis
  • interstitial pneumonitis
  • stomatitis
  • esophagitis
  • dyspepsia
  • colitis
  • gastrointestinal obstruction
  • constipation
  • renal failure
  • bullous dermatitis
  • erythema multiforme
  • toxic epidermal necrolysis
  • Stevens-Johnson syndrome
  • exfoliative dermatitis
  • abnormal desquamation
  • pruritus of skin
  • alopecia
  • urticaria
  • fever
  • fatigue
  • dysgeusia
  • skin rash
  • edema
  • anorexia
  • headache disorder
  • dyspnea
  • chest pain
  • nausea
  • vomiting
  • diarrhea
  • abnormal hepatic function tests
  • hypersensitivity drug reaction
  • acute abdominal pain
  • pancreatitis
  • radiation recall syndrome
  • peripheral sensory neuropathy

Drug Interactions

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.