Folex side effects, by duration, gender and age (a phase IV clinical study of FDA data)

Summary:

Side effects are reported by people who take Folex (methotrexate sodium). Common side effects include febrile bone marrow aplasia among females and diarrhoea among males.

The phase IV clinical study is created by eHealthMe based on 84 reports from the FDA, and is updated regularly.

What is Folex?

Folex has active ingredients of methotrexate sodium. eHealthMe is studying from 107 Folex users. Check the latest studies of Folex.

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On Aug, 22, 2026

84 people who take Folex and have side effects are studied.

Folex side effects.

What are the common side effects of Folex, by gender? *:

female:

  1. Febrile bone marrow aplasia (bone marrow greatly decreases or stops production of blood cells)
  2. Abdominal pain
  3. Balance disorder
  4. Blood pressure increased
  5. Bradycardia (abnormally slow heart action)
  6. Cough
  7. Myalgia (muscle pain)
  8. Abdominal discomfort
  9. Acute myeloid leukaemia (acute cancer in which the bone marrow makes abnormal myeloblasts)
  10. Asthenia (weakness)

male:

  1. Diarrhoea
  2. Cardiac failure
  3. Fall
  4. Feeling hot
  5. Flushing (the warm, red condition of human skin)
  6. Injection site irritation
  7. International normalised ratio decreased
  8. Interstitial lung disease
  9. Neutropenia (an abnormally low number of neutrophils)
  10. Pneumonia

What are the common side effects of Folex, by age (0-1 to 60+) *:

0-1:

n/a

2-9:

n/a

10-19:

  1. Febrile bone marrow aplasia (bone marrow greatly decreases or stops production of blood cells)

20-29:

n/a

30-39:

  1. Rhinorrhoea (watery mucus discharge from the nose)

40-49:

  1. Pneumonia

50-59:

  1. Diarrhoea
  2. Balance disorder
  3. Acute myeloid leukaemia (acute cancer in which the bone marrow makes abnormal myeloblasts)
  4. Ageusia (loss of taste functions of the tongue)
  5. Back pain
  6. Flushing (the warm, red condition of human skin)

60+:

  1. Cough
  2. Empyema (collection of pus in a cavity in the body)
  3. Myalgia (muscle pain)
  4. Abdominal discomfort
  5. Abdominal pain
  6. Acute myeloid leukaemia (acute cancer in which the bone marrow makes abnormal myeloblasts)
  7. Blood cholesterol increased
  8. Breast oedema (build-up of fluid in the breast tissue)
  9. Cardiac failure congestive
  10. Cerebrovascular accident (sudden death of some brain cells due to lack of oxygen when the blood flow to the brain is impaired by blockage or rupture)

What are the common side effects of Folex, by the time people have been on the drug (< 1 month to 10+ years)? *:

< 1 month:

  1. Diarrhoea
  2. Asthenia (weakness)

1 - 6 months:

n/a

6 - 12 months:

  1. Cardiac failure congestive

1 - 2 years:

  1. Cerebrovascular accident (sudden death of some brain cells due to lack of oxygen when the blood flow to the brain is impaired by blockage or rupture)

2 - 5 years:

n/a

5 - 10 years:

n/a

10+ years:

n/a

not specified:

  1. Blood pressure increased
  2. Bradycardia (abnormally slow heart action)
  3. Cardiac failure congestive
  4. Cough
  5. Empyema (collection of pus in a cavity in the body)
  6. Myalgia (muscle pain)
  7. Abdominal discomfort
  8. Ageusia (loss of taste functions of the tongue)
  9. Amnesia (deficit in memory caused by brain damage, disease, or psychological trauma)
  10. Anaemia (lack of blood)

* Approximation only. Some reports may have incomplete information.

Do you take Folex?

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How to use the study?

DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.



Related publications that referenced our studies

How the study uses the data?

The study is based on methotrexate sodium (the active ingredients of Folex) and Folex (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered.

Related studies are listed below in case you need more information:

Alternative drugs to, pros and cons of Folex:

All Folex side effects from A to Z:

a b c d e f g h i j k l m n o p q r s t u v w x y z

Who is eHealthMe?

With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).

WARNING, DISCLAIMER, USE FOR PUBLICATION

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

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