Flexeril and Portal hypertension - a phase IV clinical study of FDA data

Summary:

Portal hypertension is reported as a side effect among people who take Flexeril (cyclobenzaprine hydrochloride), especially for people who are female, 60+ old, also take Claritin, and have Autoimmune hepatitis.

The phase IV clinical study analyzes which people have Portal hypertension when taking Flexeril. It is created by eHealthMe based on reports of 34,789 people who have side effects when taking Flexeril from the FDA, and is updated regularly.

What is Flexeril?

Flexeril has active ingredients of cyclobenzaprine hydrochloride. It is often used in muscle spasms. eHealthMe is studying from 38,308 Flexeril users. Check the latest studies of Flexeril.

What is Portal hypertension?

Portal hypertension (increase in the blood pressure within a system of veins called the portal venous system) is found to be associated with 481 drugs and 595 conditions by eHealthMe. Check the latest studies of Portal hypertension.

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 Aug, 29, 2026

34,789 people reported to have side effects when taking Flexeril.
Among them, 12 people (0.03%) have Portal hypertension.

Could Flexeril cause Portal hypertension?

Among these 12 people:

What is the gender of people who have Portal hypertension when taking Flexeril? *

female: 63.64 %
male: 36.36 %

What is the age of people who have Portal hypertension when taking Flexeril? *

What are other drugs people take besides Flexeril? *

What are other side effects people have besides Portal hypertension? *

Gallstones (stone formation by bile component): 5 people, 41.67%
Hepatocellular Damage (liver damage): 4 people, 33.33%
Nausea And Vomiting: 3 people, 25.00%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 3 people, 25.00%
Oedema Peripheral (superficial swelling): 3 people, 25.00%
Hepatic Cirrhosis (chronic liver disease characterized by replacement of liver tissue by fibrosis, scar tissue): 3 people, 25.00%
Hepatic Steatosis (fatty liver disease): 3 people, 25.00%
Pancytopenia (medical condition in which there is a reduction in the number of red and white blood cells, as well as platelets): 3 people, 25.00%
Joint Pain: 3 people, 25.00%
Nausea (feeling of having an urge to vomit): 3 people, 25.00%

What are the existing conditions these people have? *

Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 2 people, 16.67%
Renal Cell Carcinoma (a kidney cancer): 2 people, 16.67%
Pain: 2 people, 16.67%
Autoimmune Hepatitis: 2 people, 16.67%
Trigeminal Neuralgia (a painful condition of the nerve responsible for most facial sensation): 1 person, 8.33%
Sleep Disorder: 1 person, 8.33%
Relapsing-Remitting Multiple Sclerosis (reoccurrence of an inflammatory disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged): 1 person, 8.33%
Premenstrual Syndrome: 1 person, 8.33%
Paroxysmal Nocturnal Haemoglobinuria (haemoglobin in the urine): 1 person, 8.33%
Osteoporosis (bones weak and more likely to break): 1 person, 8.33%

* Approximation only. Some reports may have incomplete information.

Do you take Flexeril and have Portal hypertension?

- Check whether Portal hypertension 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 Flexeril:

Flexeril (38,308 reports)

Browse all side effects of Flexeril:

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 Portal hypertension:

Portal hypertension (481 drugs)

Browse all the conditions that are associated with Portal hypertension:

Portal hypertension (595 conditions)

How the study uses the data?

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