L-cysteine and Dyspnea - a phase IV clinical study of FDA data

Summary:

Dyspnea is reported as a side effect among people who take L-cysteine (n - acetyl cysteine), especially for people who are male, 60+ old, also take Spiriva, and have Primary pulmonary hypertension.

The phase IV clinical study analyzes which people have Dyspnea when taking L-cysteine. It is created by eHealthMe based on reports of 305 people who have side effects when taking L-cysteine from the FDA, and is updated regularly.

What is L-cysteine?

L-cysteine has active ingredients of n - acetyl cysteine. eHealthMe is studying from 335 L-cysteine users. Check the latest studies of L-cysteine.

What is Dyspnea?

Dyspnea (difficult or laboured breathing) is found to be associated with 3,725 drugs and 6,067 conditions by eHealthMe. Check the latest studies of Dyspnea.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Sep, 01, 2026

305 people reported to have side effects when taking L-cysteine.
Among them, 21 people (6.89%) have Dyspnea.

Among these 21 people:

What is the gender of people who have Dyspnea when taking L-cysteine? *

female: 47.62 %
male: 52.38 %

What is the age of people who have Dyspnea when taking L-cysteine? *

What are other drugs people take besides L-cysteine? *

What are other side effects people have besides Dyspnea? *

Oxygen Saturation Decreased: 7 people, 33.33%
Nosebleed (bleeding from nose): 4 people, 19.05%
Diarrhea: 4 people, 19.05%
Swelling: 4 people, 19.05%
Cough: 3 people, 14.29%
Dizziness: 3 people, 14.29%
Anaemia (lack of blood): 3 people, 14.29%
Loss Of Consciousness: 3 people, 14.29%
Heart Palpitations (feelings or sensations that your heart is pounding or racing): 3 people, 14.29%
Oedema (fluid collection in tissue): 2 people, 9.52%

What are the existing conditions these people have? *

Primary Pulmonary Hypertension (primary high blood pressure that affects the arteries in the lungs and the right side of your heart): 8 people, 38.10%
Pulmonary Hypertension (increase in blood pressure in the lung artery): 4 people, 19.05%
Idiopathic Pulmonary Fibrosis (chronic lung disease): 2 people, 9.52%
Connective Tissue Disorder (any disease that has the connective tissues of the body): 2 people, 9.52%
Stress And Anxiety: 1 person, 4.76%
Secretion Discharge: 1 person, 4.76%
Rosacea (a skin condition that causes facial redness): 1 person, 4.76%
Renal Cell Carcinoma (a kidney cancer): 1 person, 4.76%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 1 person, 4.76%
Multiple Myeloma (cancer of the plasma cells): 1 person, 4.76%

* Approximation only. Some reports may have incomplete information.

Do you take L-cysteine and have Dyspnea?

- Check whether Dyspnea 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 L-cysteine:

L-cysteine (335 reports)

Dyspnea treatments and more:

Dyspnea (661,578 reports)

Browse all side effects of L-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 Dyspnea:

Dyspnea (3,725 drugs)

Browse all the conditions that are associated with Dyspnea:

Dyspnea (6,067 conditions)

How the study uses the data?

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