Garry Winkler, M.D. is an Emergency Medicine physician and Medical Toxicologist based out of Houston, Texas. He graduated from Trinity University in San Antonio, Texas with a Bachelor of Science in Biochemistry and Molecular Biology in 2008. After receiving his Medical Degree at the University of Texas Health Science Center in San Antonio, he completed his surgical internship at Boston Medical Center in Boston, MA. He completed his Emergency Medicine Residency at the University of Arizona Tucson University Campus and received a distinction in Medical Education. He further completed his Medical Toxicology fellowship at the University of California San Diego. He is currently based at the University of Texas Health Houston practicing Emergency Medicine and Toxicology. Garry serves as the current co-chair for the American Academy of Clinical Toxicology’s Diversity, Inclusion, and Equity section.

Dr. Winkler is very enthusiastic to offer Medical Toxicology consultation services at Memorial Hermann Hospital and is additionally happy to assist with consultations related to Addiction Medicine. For consultation requests please contact him through PerfectServe. If he is unable to be contacted through PerfectServe please contact him via email at He also can also be contacted by email if there is interest in Toxicology educational sessions or didactics.


Medical School
University of Texas Health Science Center in San Antonio
Internship - General Surgery
Boston Medical Center,
Residency - Emergency Medicine
University of Arizona Tucson
Fellowship - Medical Toxicology
University of California San Diego

Areas of Interest

Clinical Interests

Toxicology, LGBT patient care, Diversity, Equity, and Inclusion (DEI)


Seltzer, J., Friedman, N., Winkler, G., Lasoff, D., Cantrell, F. Unintentional pediatric lithium exposure: a 15-year retrospective analysis. Pediatric Emergency Care. July 5, 2022. doi: 10.1097/PEC.0000000000002800

Wilson, B., Bahadir, A., Andrews, M., Karpen, J., Winkler, G., Smelski, G., Dudley, S., Walter, F., Shirazi, F. (2022) Initial Experience with F(ab’)2 Antivenom Compared with Fab Antivenom for Rattlesnake Envenomations Reported to a single poison center during 2019. Toxicon. Volume 209, April 2022, Pg 10-17

Winkler, G., Minns, A., Kreshak, A. (2021) Severe Perampanel Toxicity in a Pediatric Patient With Prolonged Toxicity. The Journal of Emergency Medicine, Volume 61, Issue 5, Pg 99-102

Winkler, G., Ly, B. (2021). Hydrofluoric Acid. In Olson, K. (Eds.), Poisoning & Drug Overdose (8th ed., pages pending). Lange.

Winkler, G., Ly, B. (2021). Calcium as an Antidote. In Olson, K. (Eds.), Poisoning & Drug Overdose (8th ed., pages pending). Lange.

Winkler, G., Ly, B. (2021). Methylene Chloride. In Olson, K. (Eds.), Poisoning & Drug Overdose (8th ed., pages pending). Lange.

Greene, S., Cheng, D., Vilke, G. M., & Winkler, G. (2021). How should Native Crotalid Envenomation be Managed in the Emergency Department? The Journal of Emergency Medicine. Volume 61, Issue 1, July 2021, Pg 41-48.