Zanaflex and Flexeril drug interactions - a phase IV clinical study of FDA data
Summary:
Drug interactions are reported among people who take Zanaflex (tizanidine hydrochloride) and Flexeril (cyclobenzaprine hydrochloride). Common drug interactions include dizziness among females and depression among males.
The phase IV clinical study analyzes what interactions people have when they take Zanaflex and Flexeril. It is created by eHealthMe based on reports of 708 people who take the same drugs from the FDA, and is updated regularly.
What is Zanaflex?
Zanaflex has active ingredients of tizanidine hydrochloride. It is often used in muscle spasms. eHealthMe is studying from 17,476 Zanaflex users. Check the latest studies of Zanaflex.
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.
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 >>>.
708 people who take Zanaflex and Flexeril together, and have interactions are studied.

What are the common drug interactions of Zanaflex and Flexeril, by gender? *
What are the common drug interactions of Zanaflex and Flexeril, by age (0-1 to 60+)? *
What are the existing conditions these people have? *
* Approximation only. Some reports may have incomplete information.
Do you take Zanaflex and Flexeril?
- Personalize this study to your gender, age, symptoms and drugs
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously
Related studies:
Effectiveness of, side effects of, and alternative drugs to the 2 drugs:
Browse all drug interactions of Zanaflex and 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 zSub-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 Zanaflex:
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 zBrowse 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 zBrowse all interactions between Zanaflex and drugs from A to Z:
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 zBrowse all interactions between Flexeril and drugs from A to Z:
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 zHow the study uses the data?
The study uses data from the FDA. It is based on tizanidine hydrochloride and cyclobenzaprine hydrochloride (the active ingredients of Zanaflex and Flexeril, respectively), and Zanaflex and Flexeril (the brand names). 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.
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