Cysteine and Fever - a phase IV clinical study of FDA data

Summary:

Fever is reported as a side effect among people who take Cysteine (n - acetyl cysteine), especially for people who are male, 60+ old, have been taking the drug for < 1 month also take Sulfamethoxazole, and have High blood pressure.

The phase IV clinical study analyzes which people have Fever when taking Cysteine. It is created by eHealthMe based on reports of 1,641 people who have side effects when taking Cysteine from the FDA, and is updated regularly.

What is Cysteine?

Cysteine has active ingredients of n - acetyl cysteine. eHealthMe is studying from 1,755 Cysteine users. Check the latest studies of Cysteine.

What is Fever?

Fever is found to be associated with 3,493 drugs and 6,195 conditions by eHealthMe. Check the latest studies of Fever.

On Jul, 13, 2026

1,641 people reported to have side effects when taking Cysteine.
Among them, 57 people (3.47%) have Fever.

Among these 57 people:

How long have people been on Cysteine when they have Fever? *

What is the gender of people who have Fever when taking Cysteine? *

female: 32.08 %
male: 67.92 %

What is the age of people who have Fever when taking Cysteine? *

What are other drugs people take besides Cysteine? *

Sulfamethoxazole: 9 people, 15.79%
Sodium Bicarbonate: 8 people, 14.04%
Dexamethasone Sodium Phosphate: 8 people, 14.04%
Efavirenz: 7 people, 12.28%
Meropenem: 7 people, 12.28%
Norvir: 7 people, 12.28%
Lamivudine: 6 people, 10.53%
Acyclovir: 6 people, 10.53%
Calcitriol: 6 people, 10.53%
Insulin: 5 people, 8.77%

What are other side effects people have besides Fever? *

Weakness: 12 people, 21.05%
Productive Cough: 11 people, 19.30%
Rashes (redness): 10 people, 17.54%
Dyspnea (difficult or laboured breathing): 10 people, 17.54%
Hypokalemia (low potassium): 10 people, 17.54%
Joint Pain: 10 people, 17.54%
Nausea (feeling of having an urge to vomit): 9 people, 15.79%
Pneumonia: 8 people, 14.04%
Hepatic Cirrhosis (chronic liver disease characterized by replacement of liver tissue by fibrosis, scar tissue): 8 people, 14.04%
Myelosuppression (a decrease in the production of blood cells): 8 people, 14.04%

What are the existing conditions these people have? *

High Blood Pressure: 14 people, 24.56%
Multiple Myeloma (cancer of the plasma cells): 11 people, 19.30%
Pain: 8 people, 14.04%
Hiv Infection: 7 people, 12.28%
Osteoporosis (bones weak and more likely to break): 6 people, 10.53%
Pneumonia: 6 people, 10.53%
Primary Myelofibrosis (primary disorder of the bone marrow): 6 people, 10.53%
Urination - Excessive Volume: 5 people, 8.77%
Hypersensitivity: 4 people, 7.02%
Abdominal Discomfort: 3 people, 5.26%

* Approximation only. Some reports may have incomplete information.

Do you take Cysteine and have Fever?

- Check whether Fever is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously

Related studies:

Effectiveness of, long term effects of, and alternative drugs to Cysteine:

Cysteine (1,755 reports)

Fever treatments and more:

Fever (498,666 reports)

Browse all side effects of Cysteine:

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

Browse all the drugs that are associated with Fever:

Fever (3,493 drugs)

Browse all the conditions that are associated with Fever:

Fever (6,195 conditions)

Related publications that referenced our studies

Schiller D, Maieron A, Sch?fl R, Donnerer J, "Drug fever due to a single dose of pantoprazole", Pharmacology, 2015 Jan .
Schiller D, Maieron A, Sch?fl R, Donnerer J, "Drug fever due to a single dose of pantoprazole", Pharmacology, 2015 Jan .

How the study uses the data?

The study uses data from the FDA. It is based on n - acetyl cysteine (the active ingredients of Cysteine) and Cysteine (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.

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.

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.

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