Hyzaar and Seizures - a phase IV clinical study of FDA data

Summary:

Seizures is reported as a side effect among people who take Hyzaar (hydrochlorothiazide; losartan potassium), especially for people who are female, 60+ old, have been taking the drug for 5 - 10 years also take Norvasc, and have Narcolepsy.

The phase IV clinical study analyzes which people have Seizures when taking Hyzaar. It is created by eHealthMe based on reports of 15,960 people who have side effects when taking Hyzaar from the FDA, and is updated regularly.

What is Hyzaar?

Hyzaar has active ingredients of hydrochlorothiazide; losartan potassium. It is often used in high blood pressure. eHealthMe is studying from 16,614 Hyzaar users. Check the latest studies of Hyzaar.

What is Seizures?

Seizures (abnormal excessive or synchronous neuronal activity in the brain) is found to be associated with 1,994 drugs and 2,278 conditions by eHealthMe. Check the latest studies of Seizures.

On Jul, 26, 2026

15,960 people reported to have side effects when taking Hyzaar.
Among them, 33 people (0.21%) have Seizures.

Among these 33 people:

How long have people been on Hyzaar when they have Seizures? *

What is the gender of people who have Seizures when taking Hyzaar? *

female: 59.38 %
male: 40.62 %

What is the age of people who have Seizures when taking Hyzaar? *

What are other drugs people take besides Hyzaar? *

What are other side effects people have besides Seizures? *

Pain: 11 people, 33.33%
Joint Pain: 7 people, 21.21%
Headache (pain in head): 7 people, 21.21%
Leukopenia (less number of white blood cells in blood): 6 people, 18.18%
Migraine (headache): 6 people, 18.18%
Consciousness - Decreased: 6 people, 18.18%
Stroke (sudden death of a portion of the brain cells due to a lack of oxygen): 6 people, 18.18%
Brain Oedema (excess accumulation of fluid in the intracellular or extracellular spaces of the brain): 6 people, 18.18%
Stress And Anxiety: 5 people, 15.15%
Head Injury: 4 people, 12.12%

What are the existing conditions these people have? *

High Blood Cholesterol: 8 people, 24.24%
Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 8 people, 24.24%
Diabetes: 5 people, 15.15%
Type 2 Diabetes: 3 people, 9.09%
Arthritis (form of joint disorder that involves inflammation of one or more joints): 3 people, 9.09%
Epilepsy (common and diverse set of chronic neurological disorders characterized by seizures): 3 people, 9.09%
Depression: 3 people, 9.09%
Pain: 3 people, 9.09%
Cardiac Failure Congestive: 2 people, 6.06%
Prostate Cancer Metastatic: 2 people, 6.06%

* Approximation only. Some reports may have incomplete information.

Do you take Hyzaar and have Seizures?

- Check whether Seizures 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 Hyzaar:

Hyzaar (16,614 reports)

Seizures treatments and more:

Seizures (150,179 reports)

How severe was Seizures and when was it recovered:

Seizures in Hyzaar

Expand to all the drugs that have ingredients of hydrochlorothiazide; losartan potassium:

Seizures and drugs with ingredients of hydrochlorothiazide; losartan potassium (47 reports)

Sub-studies by gender and age:

Female: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Male: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Browse all side effects of Hyzaar:

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 Seizures:

Seizures (1,994 drugs)

Browse all the conditions that are associated with Seizures:

Seizures (2,278 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on hydrochlorothiazide; losartan potassium (the active ingredients of Hyzaar) and Hyzaar (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.