Contact Us 888.648.3390  |  Monday to Friday - 8am to 5pm | email | 214 N. 16th St. #120, McAllen, Texas 78501

We are South Texas Institutes of Health

A Non-profit Organization Performing Educational, Community Outreach and Research Programs Since 2006

Experienced local staff are here to aid you.
We're glad you're interested in what we do!
South Texas Institutes of Health was created to benefit the community by providing clinical research, community outreach and educational programs.
South Texas Institutes of Health (STxIH), an incorporated 501(c)(3) nonprofit, was created in September 2006 to meet the needs of community members and healthcare providers in South Texas and beyond. Our goals include to educate and provide care to members of our community and to help scientists answer questions about how to care for people so we can raise the level of care that our friends, families, and neighbors receive without imposing additional healthcare costs. South Texas Institutes of Health allies with local universities and other community organizations because together we can achieve more for our community.

Meet our Experienced Team

Experienced doctors and Scientist form our medical staff

Dr. Steven M. Stoltz

Family Practice Doctor

Lori Lizak, R.N., C.C.R.C.

Registered Nurse

Wendy Lavoie, C.R.C.

Clinical Research Cordinator
Daisy 1

Daisy Lopez, M.A.

Medical Assistant

Kathy De Leon, C.M.C., M.A.

Office Manager

Check out Our Services

A Wide Variety of Service
Family Medicine

Routine vital signs, height and weight measurements will begin the visit.  You will have the opportunity to be seen for routine preventative care or to address problems during your visit.  We see adults and children and bilingual services are available

Clinical Trials

While our mission is a noble one, it takes a great deal of effort to accomplish our goals.  Our medical team, including a physician, registered nurse and medical assistant provide direct patient care.  Our research coordinator leads the clinical research team and oversees clinical trials to ensure that participants in our studies are well cared for.  We submit grant applications to obtain funding to achieve our vision, research medical topics, and propose clinical protocols.

Community Outreach


Throughout the year, various health screening and services will be offered as part of our community outreach efforts related to education and some involving research, but that's not all!!  STxIH will continue to provide health screening and other services at little or no cost-depending on specific events.  In order to reach those who will benefit the most, we will often partner with another organization who has common goals.  Dr. Stoltz and other team members will be volunteering at different venues as needed to accomplish our goals.  Follow us on social media to keep informed and to participate.

Educational Programs

STxIH will continue to promote health adn well-being to members of our community.  The Rio Grande Valley and Austin are specifically targeted.  We are developing programs aimed at Healthcare providers at various levels and with varied skills, as well as for Healthcare consumers-patients and families.  We will continue these efforts in special consideration to access to quality Healthcare, as well as prevention and treatment of cancer and metabolic problems such as obesity, diabetes, high blood pressure and high cholesterol.  Follow us on social media to keep informed and to participate with our programs.


We are currently working on collaborative partnerships which will allow us to keep learning how to best care for patients.  It is through academic and other pharmaceutical clinical trials where we determine this.  Please check here to see what we're up to, and to contact us if you or someone you know may be interested in participating in our efforts.

Prescription Assistance


Our office can assist you to see if you qualify for prescription assistance by showing you how to download the appropriate forms as needed and how to fill out the applications.  If you are unable to take the time to learn how to fill out the appropriate applications, you can do this anytime you need to at your home.