Keflex and Fatigue - from FDA reports

Fatigue is found among people who take Keflex, especially for people who are female, 60+ old , have been taking the drug for < 1 month, also take medication Zometa, and have Pain. This study is created by eHealthMe based on reports of 9,744 people who have side effects when taking Keflex from FDA, and is updated regularly.

How to use this study: bring a copy to your health teams to ensure drug risks and benefits are fully discussed and understood.

Who is eHealthMe: we are a data analysis company who specializes in health care industry. Our original studies have been referenced on 500+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and EANO. On eHealthMe, you can research drugs and monitor them (see testimonials). If you find eHealthMe useful, please help us to spread the words below or leave us a testimonial.

On Oct, 12, 2018

9,744 people reported to have side effects when taking Keflex.
Among them, 1,033 people (10.6%) have Fatigue

Number of reports submitted per year:

Could Keflex cause Fatigue?

Time on Keflex when people have Fatigue *:

Gender of people who have Fatigue when taking Keflex *:

  • female: 63.98 %
  • male: 36.02 %

Age of people who have Fatigue when taking Keflex *:

Top conditions involved for these people *:

  1. Pain: 101 people, 9.78%
  2. Multiple Myeloma (cancer of the plasma cells): 57 people, 5.52%
  3. Osteoporosis (bones weak and more likely to break): 55 people, 5.32%
  4. Metastases To Bone (cancer spreads to bone): 55 people, 5.32%
  5. Breast Cancer: 48 people, 4.65%

Click here to view more results or personalize the results to your gender and age

Top co-used drugs for these people *:

  1. Zometa: 286 people, 27.69%
  2. Lasix: 221 people, 21.39%
  3. Ambien: 207 people, 20.04%
  4. Aredia: 193 people, 18.68%
  5. Vicodin: 187 people, 18.10%

Click here to view more results or personalize the results to your gender and age

Top other side effects for these people *:

  1. Pain: 405 people, 39.21%
  2. Stress And Anxiety: 402 people, 38.92%
  3. Weakness: 360 people, 34.85%
  4. Back Pain: 333 people, 32.24%
  5. Nausea (feeling of having an urge to vomit): 322 people, 31.17%

Click here to view more results or personalize the results to your gender and age

* Approximation only. Some reports may have incomplete information.

FDA reports used in this study

Do you have Fatigue while taking Keflex?

You are not alone:

Related studies


Keflex has active ingredients of cephalexin. It is often used in infection. (latest outcomes from Keflex 10,591 users)


Fatigue (feeling of tiredness) has been reported by people with multiple sclerosis, rheumatoid arthritis, high blood pressure, hepatitis c, depression (latest reports from 491,634 Fatigue patients).

Drugs that are associated with Fatigue
Fatigue (4,374 drugs)
Could your condition cause Fatigue
Fatigue (5,459 conditions)
Keflex side effects
Browse all side effects of Keflex
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

Related publications that referenced our studies

What would happen?

Predict new side effects and undetected conditions when you take Keflex and have Fatigue

Recent updates

Recent general studies
Recent personal studies

NOTE: The study is based on active ingredients and brand name. Other drugs that have the same active ingredients (e.g. generic drugs) are NOT considered.

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 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, and has not been supported by scientific studies or clinical trials unless otherwise stated. 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.

You may report adverse side effects to the FDA at or 1-800-FDA-1088 (1-800-332-1088).

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.

Submit your testimonial

  • Please fill in your Testimonial.
  • Please enter a minimum of 10 characters for your Testimonial.
  • Please fill in your Name.

Please wait...


Thank you!