Fentanyl and Anticholinergic syndrome - a phase IV clinical study of FDA data

Summary:

Anticholinergic syndrome is reported as a side effect among people who take Fentanyl (fentanyl citrate), especially for people who are female, 30-39 old, also take Propofol, and have General anaesthesia.

The phase IV clinical study analyzes which people have Anticholinergic syndrome when taking Fentanyl. It is created by eHealthMe based on reports of 72,646 people who have side effects when taking Fentanyl from the FDA, and is updated regularly.

What is Fentanyl?

Fentanyl has active ingredients of fentanyl citrate. It is often used in pain. eHealthMe is studying from 73,301 Fentanyl users. Check the latest studies of Fentanyl.

What is Anticholinergic syndrome?

Anticholinergic syndrome (absolute or relative reduction in cholinergic activity in the central nervous system) is found to be associated with 127 drugs and 323 conditions by eHealthMe. Check the latest studies of Anticholinergic syndrome.

On Jul, 24, 2026

72,646 people reported to have side effects when taking Fentanyl.
Among them, 29 people (0.04%) have Anticholinergic syndrome.

Could Fentanyl cause Anticholinergic syndrome?

Among these 29 people:

What is the gender of people who have Anticholinergic syndrome when taking Fentanyl? *

female: 75 %
male: 25 %

What is the age of people who have Anticholinergic syndrome when taking Fentanyl? *

What are other drugs people take besides Fentanyl? *

Midazolam: 12 people, 41.38%
Propofol: 12 people, 41.38%
Ondansetron: 5 people, 17.24%
Scopolamine: 5 people, 17.24%
Atropine: 4 people, 13.79%
Citalopram Hydrobromide: 4 people, 13.79%
Dexamethasone: 4 people, 13.79%
Sevoflurane: 4 people, 13.79%
Ranitidine: 4 people, 13.79%
Rocuronium Bromide: 3 people, 10.34%

What are other side effects people have besides Anticholinergic syndrome? *

Mydriasis (a dilation of the pupil): 7 people, 24.14%
Depressed Level Of Consciousness: 6 people, 20.69%
Apnea (temporary absence or cessation of breathing): 4 people, 13.79%
Unresponsive To Stimuli: 4 people, 13.79%
Agitation (state of anxiety or nervous excitement): 4 people, 13.79%
Consciousness - Decreased: 3 people, 10.34%
Confusion: 3 people, 10.34%
Respiratory Depression (respiration has a rate below 12 breaths): 3 people, 10.34%
Serotonin Syndrome (occurs when two drugs that affect the body's level of serotonin are taken together at the same time): 2 people, 6.90%
Arrhythmias (irregular heartbeat): 2 people, 6.90%

What are the existing conditions these people have? *

General Anaesthesia: 5 people, 17.24%
Sedation: 4 people, 13.79%
Anaesthesia: 4 people, 13.79%
Depression: 3 people, 10.34%
Salivary Hypersecretion (excess saliva secretion): 2 people, 6.90%
Pneumonia Aspiration (bronchopneumonia that develops due to the entrance of foreign materials into the bronchial tree): 2 people, 6.90%
Obsessive-Compulsive Disorder (an anxiety disorder characterized by intrusive thoughts that produce uneasiness, apprehension, fear, or worry;): 2 people, 6.90%
Neuromuscular Blockade Reversal: 2 people, 6.90%
Respiratory Depression (respiration has a rate below 12 breaths): 1 person, 3.45%
Procedural Pain: 1 person, 3.45%

* Approximation only. Some reports may have incomplete information.

Do you take Fentanyl and have Anticholinergic syndrome?

- Check whether Anticholinergic syndrome 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 Fentanyl:

Fentanyl (73,301 reports)

Browse all side effects of Fentanyl:

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 Anticholinergic syndrome:

Anticholinergic syndrome (127 drugs)

Browse all the conditions that are associated with Anticholinergic syndrome:

Anticholinergic syndrome (323 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on fentanyl citrate (the active ingredients of Fentanyl) and Fentanyl (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.