Astelin and Confusion - a phase IV clinical study of FDA data

Summary:

Confusion is reported as a side effect among people who take Astelin (azelastine hydrochloride), especially for people who are female, 60+ old, also take Flexeril, and have Asthma.

The phase IV clinical study analyzes which people have Confusion when taking Astelin. It is created by eHealthMe based on reports of 5,326 people who have side effects when taking Astelin from the FDA, and is updated regularly.

What is Astelin?

Astelin has active ingredients of azelastine hydrochloride. It is often used in allergies. eHealthMe is studying from 5,538 Astelin users. Check the latest studies of Astelin.

What is Confusion?

Confusion is found to be associated with 1,833 drugs and 2,829 conditions by eHealthMe. Check the latest studies of Confusion.

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

5,326 people reported to have side effects when taking Astelin.
Among them, 16 people (0.3%) have Confusion.

Among these 16 people:

What is the gender of people who have Confusion when taking Astelin? *

female: 62.5 %
male: 37.5 %

What is the age of people who have Confusion when taking Astelin? *

What are other drugs people take besides Astelin? *

What are other side effects people have besides Confusion? *

Fatigue (feeling of tiredness): 6 people, 37.50%
Balance Disorder: 4 people, 25.00%
Memory Loss: 4 people, 25.00%
Neck Pain: 4 people, 25.00%
Joint Dislocation (a joint position is changed from normal position): 3 people, 18.75%
Constipation: 3 people, 18.75%
Pain: 3 people, 18.75%
Stress And Anxiety: 3 people, 18.75%
Dizziness: 3 people, 18.75%
Joint Range Of Motion Decreased (disease of joint movement): 2 people, 12.50%

What are the existing conditions these people have? *

Asthma: 3 people, 18.75%
Muscle Aches (muscle pain): 2 people, 12.50%
Central Pain Syndrome (neurological condition caused by damage or malfunction in the central nervous system): 2 people, 12.50%
Convulsion (muscles contract and relax rapidly and repeatedly, resulting in an uncontrolled shaking of the body): 2 people, 12.50%
Fibromyalgia (a long-term condition which causes pain all over the body): 2 people, 12.50%
Gout (uric acid crystals building up in the body): 2 people, 12.50%
Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 2 people, 12.50%
Senile Osteoporosis (weak bones with ageing): 2 people, 12.50%
Myositis (inflammation of the muscles): 2 people, 12.50%
Osteopenia (a condition where bone mineral density is lower than normal): 2 people, 12.50%

* Approximation only. Some reports may have incomplete information.

Do you take Astelin and have Confusion?

- Check whether Confusion 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 Astelin:

Astelin (5,538 reports)

Confusion treatments and more:

Confusion (65,238 reports)

Browse all side effects of Astelin:

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 Confusion:

Confusion (1,833 drugs)

Browse all the conditions that are associated with Confusion:

Confusion (2,829 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on azelastine hydrochloride (the active ingredients of Astelin) and Astelin (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.