Tenex and Muscle twitching - a phase IV clinical study of FDA data

Summary:

Muscle twitching is reported as a side effect among people who take Tenex (guanfacine hydrochloride), especially for people who are male, 10-19 old, also take Geodon, and have Lennox-gastaut syndrome.

The phase IV clinical study analyzes which people have Muscle twitching when taking Tenex. It is created by eHealthMe based on reports of 1,615 people who have side effects when taking Tenex from the FDA, and is updated regularly.

What is Tenex?

Tenex has active ingredients of guanfacine hydrochloride. It is often used in attention deficit hyperactivity disorder. eHealthMe is studying from 1,865 Tenex users. Check the latest studies of Tenex.

What is Muscle twitching?

Muscle twitching is found to be associated with 1,235 drugs and 1,905 conditions by eHealthMe. Check the latest studies of Muscle twitching.

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

1,615 people reported to have side effects when taking Tenex.
Among them, 14 people (0.87%) have Muscle twitching.

Among these 14 people:

What is the gender of people who have Muscle twitching when taking Tenex? *

female: 14.29 %
male: 85.71 %

What is the age of people who have Muscle twitching when taking Tenex? *

What are other drugs people take besides Tenex? *

What are other side effects people have besides Muscle twitching? *

Agitation (state of anxiety or nervous excitement): 6 people, 42.86%
Tremor (trembling or shaking movements in one or more parts of your body): 6 people, 42.86%
Dyskinesia (abnormality or impairment of voluntary movement): 6 people, 42.86%
Nausea And Vomiting: 6 people, 42.86%
Abnormal Behavior: 5 people, 35.71%
Fever: 4 people, 28.57%
Gaze Palsy (disorders affecting the ability to move both eyes in the same direction): 4 people, 28.57%
Pharyngitis Streptococcal (inflammation of the pharynx caused by infection from. streptococcus): 4 people, 28.57%
Confusional State: 4 people, 28.57%
Mydriasis (a dilation of the pupil): 4 people, 28.57%

What are the existing conditions these people have? *

Lennox-Gastaut Syndrome (epilepsy characterized by frequent seizures and different seizure types): 4 people, 28.57%
Agitation (state of anxiety or nervous excitement): 3 people, 21.43%
Bipolar Disorder (mood disorder): 2 people, 14.29%
Stress And Anxiety: 1 person, 7.14%
Sinus Headache (headache caused by sinus infections): 1 person, 7.14%
Psychotic Behavior: 1 person, 7.14%
Obsessive-Compulsive Disorder (an anxiety disorder characterized by intrusive thoughts that produce uneasiness, apprehension, fear, or worry;): 1 person, 7.14%
Insomnia (sleeplessness): 1 person, 7.14%
Impulse-Control Disorder: 1 person, 7.14%
Depression: 1 person, 7.14%

* Approximation only. Some reports may have incomplete information.

Do you take Tenex and have Muscle twitching?

- Check whether Muscle twitching 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 Tenex:

Tenex (1,865 reports)

Muscle twitching treatments and more:

Muscle twitching (29,030 reports)

Browse all side effects of Tenex:

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 Muscle twitching:

Muscle twitching (1,235 drugs)

Browse all the conditions that are associated with Muscle twitching:

Muscle twitching (1,905 conditions)

How the study uses the data?

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