Focalin and Weakness - a phase IV clinical study of FDA data

Summary:

Weakness is reported as a side effect among people who take Focalin (dexmethylphenidate hydrochloride), especially for people who are female, 50-59 old, have been taking the drug for < 1 month also take Vitamin D3, and have Nausea.

The phase IV clinical study analyzes which people have Weakness when taking Focalin. It is created by eHealthMe based on reports of 3,802 people who have side effects when taking Focalin from the FDA, and is updated regularly.

What is Focalin?

Focalin has active ingredients of dexmethylphenidate hydrochloride. It is often used in attention deficit hyperactivity disorder. eHealthMe is studying from 4,781 Focalin users. Check the latest studies of Focalin.

What is Weakness?

Weakness is found to be associated with 3,640 drugs and 6,613 conditions by eHealthMe. Check the latest studies of Weakness.

On Jul, 13, 2026

3,802 people reported to have side effects when taking Focalin.
Among them, 70 people (1.84%) have Weakness.

Among these 70 people:

How long have people been on Focalin when they have Weakness? *

What is the gender of people who have Weakness when taking Focalin? *

female: 60 %
male: 40 %

What is the age of people who have Weakness when taking Focalin? *

What are other drugs people take besides Focalin? *

What are other side effects people have besides Weakness? *

Fatigue (feeling of tiredness): 28 people, 40.00%
Headache (pain in head): 15 people, 21.43%
Fall: 15 people, 21.43%
Gait Disturbance: 15 people, 21.43%
Abdominal Pain: 14 people, 20.00%
Nausea And Vomiting: 12 people, 17.14%
Joint Pain: 12 people, 17.14%
Dizziness: 12 people, 17.14%
Rashes (redness): 11 people, 15.71%
Pain: 11 people, 15.71%

What are the existing conditions these people have? *

Nausea (feeling of having an urge to vomit): 9 people, 12.86%
Immunodeficiency Common Variable: 8 people, 11.43%
Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 7 people, 10.00%
Depression: 6 people, 8.57%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 6 people, 8.57%
Asthma: 5 people, 7.14%
Blood Testosterone Decreased: 4 people, 5.71%
Gallstones (stone formation by bile component): 4 people, 5.71%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 4 people, 5.71%
Headache (pain in head): 4 people, 5.71%

* Approximation only. Some reports may have incomplete information.

Do you take Focalin and have Weakness?

- Check whether Weakness 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 Focalin:

Focalin (4,781 reports)

Weakness treatments and more:

Weakness (586,876 reports)

How severe was Weakness and when was it recovered:

Weakness in Focalin

Expand to all the drugs that have ingredients of dexmethylphenidate hydrochloride:

Weakness and drugs with ingredients of dexmethylphenidate hydrochloride (129 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 Focalin:

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 Weakness:

Weakness (3,640 drugs)

Browse all the conditions that are associated with Weakness:

Weakness (6,613 conditions)

How the study uses the data?

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