Fosphenytoin sodium and Drowsiness - a phase IV clinical study of FDA data

Summary:

Drowsiness is reported as a side effect among people who take Fosphenytoin sodium (fosphenytoin sodium), especially for people who are female, 20-29 old, have been taking the drug for < 1 month also take Midazolam, and have Seizures.

The phase IV clinical study analyzes which people have Drowsiness when taking Fosphenytoin sodium. It is created by eHealthMe based on reports of 988 people who have side effects when taking Fosphenytoin sodium from the FDA, and is updated regularly.

What is Fosphenytoin sodium?

Fosphenytoin sodium has active ingredients of fosphenytoin sodium. eHealthMe is studying from 989 Fosphenytoin sodium users. Check the latest studies of Fosphenytoin sodium.

What is Drowsiness?

Drowsiness is found to be associated with 2,863 drugs and 4,801 conditions by eHealthMe. Check the latest studies of Drowsiness.

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

988 people reported to have side effects when taking Fosphenytoin sodium.
Among them, 19 people (1.92%) have Drowsiness.

Could Fosphenytoin sodium cause Drowsiness?

Among these 19 people:

How long have people been on Fosphenytoin sodium when they have Drowsiness? *

What is the gender of people who have Drowsiness when taking Fosphenytoin sodium? *

female: 61.11 %
male: 38.89 %

What is the age of people who have Drowsiness when taking Fosphenytoin sodium? *

What are other drugs people take besides Fosphenytoin sodium? *

What are other side effects people have besides Drowsiness? *

Blood Alkaline Phosphatase Increased: 5 people, 26.32%
Bilirubin Conjugated Increased: 5 people, 26.32%
Coma Hepatic (accumulation in the bloodstream of toxic substances that are normally removed by the liver leads coma): 5 people, 26.32%
Alanine Aminotransferase Increased: 5 people, 26.32%
Hepatic Failure (liver failure): 5 people, 26.32%
Ammonia Increased: 5 people, 26.32%
Drug Resistance (reduction in effectiveness of a drug): 5 people, 26.32%
Blood Lactic Acid Increased: 5 people, 26.32%
International Normalised Ratio Increased: 5 people, 26.32%
Blood Bilirubin Increased: 5 people, 26.32%

What are the existing conditions these people have? *

Seizures (abnormal excessive or synchronous neuronal activity in the brain): 9 people, 47.37%
Epilepsy (common and diverse set of chronic neurological disorders characterized by seizures): 7 people, 36.84%
Status Epilepticus (a life-threatening condition in which the brain is in a state of persistent seizure): 6 people, 31.58%
High Blood Pressure: 4 people, 21.05%
Haemorrhage Intracranial (bleeding within the skull): 3 people, 15.79%
Pneumonia: 3 people, 15.79%
Thrombosis (formation of a blood clot inside a blood vessel): 2 people, 10.53%
Iron Deficiency Anaemia: 2 people, 10.53%
High Risk Pregnancy: 2 people, 10.53%
Temporal Lobe Epilepsy (a term that refers to a condition where seizures are generated in the portion of the brain called the temporal lobe): 1 person, 5.26%

* Approximation only. Some reports may have incomplete information.

Do you take Fosphenytoin sodium and have Drowsiness?

- Check whether Drowsiness 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 Fosphenytoin sodium:

Fosphenytoin sodium (989 reports)

Drowsiness treatments and more:

Drowsiness (269,040 reports)

Browse all side effects of Fosphenytoin sodium:

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 Drowsiness:

Drowsiness (2,863 drugs)

Browse all the conditions that are associated with Drowsiness:

Drowsiness (4,801 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on fosphenytoin sodium (the active ingredients of Fosphenytoin sodium) and Fosphenytoin sodium (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.