Theo-dur and Swallowing difficulty - a phase IV clinical study of FDA data

Summary:

Swallowing difficulty is reported as a side effect among people who take Theo-dur (theophylline), especially for people who are female, 60+ old, have been taking the drug for 1 - 6 months also take Flovent, and have Pain.

The phase IV clinical study analyzes which people have Swallowing difficulty when taking Theo-dur. It is created by eHealthMe based on reports of 4,432 people who have side effects when taking Theo-dur from the FDA, and is updated regularly.

What is Theo-dur?

Theo-dur has active ingredients of theophylline. It is often used in asthma. eHealthMe is studying from 4,451 Theo-dur users. Check the latest studies of Theo-dur.

What is Swallowing difficulty?

Swallowing difficulty is found to be associated with 2,402 drugs and 3,354 conditions by eHealthMe. Check the latest studies of Swallowing difficulty.

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, 02, 2026

4,432 people reported to have side effects when taking Theo-dur.
Among them, 27 people (0.61%) have Swallowing difficulty.

Could Theo-dur cause Swallowing difficulty?

Among these 27 people:

How long have people been on Theo-dur when they have Swallowing difficulty? *

What is the gender of people who have Swallowing difficulty when taking Theo-dur? *

female: 55.56 %
male: 44.44 %

What is the age of people who have Swallowing difficulty when taking Theo-dur? *

What are other drugs people take besides Theo-dur? *

What are other side effects people have besides Swallowing difficulty? *

Upper Respiratory Tract Infection: 7 people, 25.93%
Pain: 7 people, 25.93%
Abdominal Pain Upper: 7 people, 25.93%
High Blood Pressure: 6 people, 22.22%
Colonic Polyp (extra part of colon tissue grow in intestine): 5 people, 18.52%
Headache (pain in head): 5 people, 18.52%
Coronary Heart Disease (narrowing or blockage of the coronary arteries): 5 people, 18.52%
Nausea (feeling of having an urge to vomit): 5 people, 18.52%
Drug Ineffective: 5 people, 18.52%
Carpal Tunnel Syndrome (nerve compression at wrist results numbness weakness, pain , swelling): 4 people, 14.81%

What are the existing conditions these people have? *

Pain: 7 people, 25.93%
High Blood Pressure: 3 people, 11.11%
Bronchitis Chronic (inflammation of the mucous membrane in the bronchial tubes- chronic): 3 people, 11.11%
Joint Pain: 3 people, 11.11%
Insomnia (sleeplessness): 3 people, 11.11%
Gastritis (inflammation of stomach): 3 people, 11.11%
Eating Disorder: 2 people, 7.41%
Cardiac Failure: 2 people, 7.41%
Parkinson's Disease: 2 people, 7.41%
Orthostatic Hypotension (a medical condition consisting of a sudden decrease in blood pressure when a person stands up): 2 people, 7.41%

* Approximation only. Some reports may have incomplete information.

Do you take Theo-dur and have Swallowing difficulty?

- Check whether Swallowing difficulty 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 Theo-dur:

Theo-dur (4,451 reports)

Browse all side effects of Theo-dur:

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 Swallowing difficulty:

Swallowing difficulty (2,402 drugs)

Browse all the conditions that are associated with Swallowing difficulty:

Swallowing difficulty (3,354 conditions)

Related publications that referenced our studies

Korang-Yeboah M, Rahman Z, Shah D, Mohammad A, Wu S, Siddiqui A, Khan MA, "Impact of formulation and process variables on solid-state stability of theophylline in controlled release formulations", International journal of pharmaceutics, 2016 Feb .
Dhaval MK, "Impact of formulation and process variables on solid-state stability of theophylline in controlled release formulations", International Journal of Pharmaceutics, 2016 Jan .
Korang-Yeboah M, Rahman Z, Shah D, Mohammad A, Wu S, Siddiqui A, Khan MA, "Impact of formulation and process variables on solid-state stability of theophylline in controlled release formulations", International journal of pharmaceutics, 2016 Feb .
Dhaval MK, "Impact of formulation and process variables on solid-state stability of theophylline in controlled release formulations", International Journal of Pharmaceutics, 2016 Jan .

How the study uses the data?

The study uses data from the FDA. It is based on theophylline (the active ingredients of Theo-dur) and Theo-dur (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.