Chloramphenicol and Drowsiness - a phase IV clinical study of FDA data


Drowsiness is found among people who take Chloramphenicol, especially for people who are female, 60+ old, have been taking the drug for < 1 month.

The phase IV clinical study analyzes which people take Chloramphenicol and have Drowsiness. It is created by eHealthMe based on reports of 2,081 people who have side effects when taking Chloramphenicol from the FDA, and is updated regularly. You can use the study as a second opinion to make health care decisions.

Phase IV trials are used to detect adverse drug outcomes and monitor drug effectiveness in the real world. With medical big data and AI algorithms, eHealthMe is running millions of phase IV trials and makes the results available to the public. Our original studies have been referenced on 600+ medical publications including The Lancet, Mayo Clinic Proceedings, and Nature.

On May, 26, 2023

2,081 people reported to have side effects when taking Chloramphenicol.
Among them, 37 people (1.78%) have Drowsiness.

What is Chloramphenicol?

Chloramphenicol has active ingredients of chloramphenicol. eHealthMe is studying from 2,094 Chloramphenicol users for its effectiveness, alternative drugs and more.

What is Drowsiness?

Drowsiness is found to be associated with 4,271 drugs and 4,565 conditions by eHealthMe.

Number of Chloramphenicol and Drowsiness reports submitted per year:

Could Chloramphenicol cause Drowsiness?

Time on Chloramphenicol when people have Drowsiness *:

  • < 1 month: 33.33 %
  • 1 - 6 months: 33.33 %
  • 6 - 12 months: 0.0 %
  • 1 - 2 years: 33.33 %
  • 2 - 5 years: 0.0 %
  • 5 - 10 years: 0.0 %
  • 10+ years: 0.0 %

Gender of people who have Drowsiness when taking Chloramphenicol *:

  • female: 53.12 %
  • male: 46.88 %

Age of people who have Drowsiness when taking Chloramphenicol *:

  • 0-1: 0.0 %
  • 2-9: 5.88 %
  • 10-19: 8.82 %
  • 20-29: 32.35 %
  • 30-39: 0.0 %
  • 40-49: 2.94 %
  • 50-59: 2.94 %
  • 60+: 47.06 %

Common drugs people take besides Chloramphenicol *:

  1. Senna: 13 people, 35.14%
  2. Bisacodyl: 11 people, 29.73%
  3. Lansoprazole: 9 people, 24.32%
  4. Pegasys: 9 people, 24.32%
  5. Gabapentin: 8 people, 21.62%
  6. Pregabalin: 8 people, 21.62%
  7. Acetaminophen: 7 people, 18.92%
  8. Dexamethasone: 7 people, 18.92%
  9. Colecalciferol: 7 people, 18.92%
  10. Amitriptyline Hydrochloride: 6 people, 16.22%

Common side effects people have besides Drowsiness *:

  1. Fatigue (feeling of tiredness): 18 people, 48.65%
  2. Stress And Anxiety: 13 people, 35.14%
  3. Pain: 13 people, 35.14%
  4. Depressed Mood: 12 people, 32.43%
  5. Disturbance In Attention: 12 people, 32.43%
  6. Mood Swings (an extreme or rapid change in mood): 11 people, 29.73%
  7. Depression: 10 people, 27.03%
  8. Anger: 10 people, 27.03%
  9. Hypoaesthesia (reduced sense of touch or sensation): 10 people, 27.03%
  10. Jaundice - Yellow Skin (a yellowish pigmentation of the skin): 10 people, 27.03%

Common conditions people have *:

  1. Burning Sensation: 6 people, 16.22%
  2. Pain: 4 people, 10.81%
  3. Ventricular Fibrillation (abnormally irregular heart rhythm): 3 people, 8.11%
  4. Nausea (feeling of having an urge to vomit): 3 people, 8.11%
  5. Bacterial Infection: 3 people, 8.11%
  6. Blood Phosphorus Increased: 3 people, 8.11%
  7. Blood Uric Acid Increased: 3 people, 8.11%
  8. Breathing Difficulty: 3 people, 8.11%
  9. Chronic Obstructive Pulmonary Disease (a progressive disease that makes it hard to breathe): 3 people, 8.11%
  10. Constipation: 3 people, 8.11%

* Approximation only. Some reports may have incomplete information.

Do you take Chloramphenicol and have Drowsiness?

Check whether Drowsiness is associated with a drug or a condition

How to use the study?

You can discuss the study with your doctor, to ensure that all drug risks and benefits are fully discussed and understood.

Related studies

How severe was Drowsiness and when was it recovered:

Expand to all the drugs that have ingredients of chloramphenicol:

Alternative drugs to, pros and cons of Chloramphenicol:

Common Chloramphenicol side effects:

Browse all side effects of Chloramphenicol:

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

Drowsiness treatments and more:

COVID vaccines that are related to Drowsiness:

Common drugs associated with Drowsiness:

All the drugs that are associated with Drowsiness:

Common conditions associated with Drowsiness:

All the conditions that are associated with Drowsiness:

How the study uses the data?

The study uses data from the FDA. It is based on chloramphenicol (the active ingredients of Chloramphenicol) and Chloramphenicol (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered. Dosage of drugs is not considered in the study.

Who is eHealthMe?

With medical big data and proven AI 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 600+ 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: 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. 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.

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

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