The Pfizer New Haven Clinical Research Unit is conducting a clinical trial to compare two tablets of Dilantin® Infatabs® (chewable phenytoin tablets) that were produced at two different manufacturing sites.

While Dilantin® Infatabs® are currently used in the treatment of epilepsy and are available by prescription, their use in this study is for research purposes only and has not been proven safe or effective. Dilantin® Infatabs® may be referred to as “study drug” or “study medication” in the information below and throughout the study.

Epilepsy is broad term used to describe a brain disorder that causes seizures. The CDC estimates about 3.4 million people in the US have epilepsy, including about 470,000 children. There are many different types of epilepsy with varying levels of impact on the patient’s daily life. While medicines do exist to reduce the severity or frequency of seizures, they must be taken consistently to be the most effective. Patients therefore rely on their medications being the same no matter where they are manufactured.

Read more below to see how you could support patients as a healthy volunteer.

Who may participate

Volunteers are essential to progress. When you make the choice to participate in a clinical trial, you become the main character of medical research.

This study is seeking healthy adult volunteers, meaning that the participants will not have the condition being studied and are in overall good health. In addition to the criteria listed, participants must meet the following requirements: 

  • Willing to take a study drug
  • Willing and able to come to our facility in New Haven, CT*
  • Willing and able to comply with all study procedures

*participants may be eligible to receive a bonus for travel, ask our staff for details

**females must be unable to bear children

There are other requirements for participation in this study. The study staff will explain these to you during the screening process.

Do you know someone who may meet these requirements? Refer a friend and you may be eligible to receive a bonus. 

Learn more




18+ years


All sexes**

Referral bonus

Up to $200

Each clinical study has its own guidelines for who can participate, called eligibility criteria. However, only the research study staff can determine if you qualify to enroll in the study.

What to expect

If this study may be a fit for you, you’ll be invited to a screening visit at our facility in New Haven, CT. If you qualify for the study, there may be a period of up to 28 days before dosing.

If you choose to participate, you will stay at our facility two separate times for 4 overnights each, scheduled about 2 weeks apart. On the first morning of each stay, you will receive a single dose of the study medication as a tablet which you are to swallow, for a total of 2 doses during the study. Both doses are the same strength, but were produced at different manufacturing locations.

Throughout the study, staff will closely monitor your health status and collect data, such as the levels of the study drug in your blood.

All of the study procedures will be clearly explained to you during screening and can be viewed by downloading the informed consent form.

Download informed consent form

Required overnight stays

8 nights over 2 stays (4 nights each)

Long-term follow up

1 phone call

How long is this study?

About 56 days


Up to $3,160 upon completion of the study

The PCRU Loyalty Program has arrived!

Our new Loyalty Program offers unique tiered gifts for new and returning participants.


Interested in participating?

Complete and submit this form, and a Pfizer New Haven Clinical Research Unit (PCRU) representative will contact you. Please note: volunteers completing this form must be able to read and speak English at an 8th grade level.

You may also call 1-800-254-6398 and speak with a PCRU representative to learn more.

For Japanese language assistance only, please call 1-833-711-9984. We apologize, our representatives cannot take calls in languages other than English or Japanese at this time.

The personal data gathered here will be collected, processed, and maintained in a confidential manner. Your information will be stored in our research unit’s database. We may use this information to invite you to participate in current and future clinical studies at the PCRU. You will have full access to your records at the Pfizer New Haven Clinical Research Unit and the opportunity to correct them if necessary.

All fields marked with * are required.