Dr. Robert Tan

Dr. Tan specializes in aging endocrinology and sexual health for men and women. He treats low testosterone, andropause, erectile dysfunction, menopause, osteoporosis, memory loss, and weight management. He also screens patients for cognitive decline and manages enlarged prostate conditions.

Dr. Tan has focused on hormone replacement therapy since founding Opal Medical Clinic in 2007. The clinic ranks among the earliest centers in the United States to treat low testosterone conditions. He delivers individualized Bioidentical Hormone Replacement Therapy using topical formulas, injections, and implants through partnerships with compounding pharmacies.

Dr. Tan first described "DEC Syndrome" in 2003, linking depression, erectile dysfunction, and coronary heart disease. He published that work in The Journal of Gender Specific Medicine. He has also researched testosterone's role in memory and Alzheimer's disease using PET scans and MRI, and has presented findings on testosterone and heart disease at meetings of the American Association of Clinical Endocrinologists.

Dr. Tan appeared alongside physicians from Johns Hopkins and Brown University in a Public Television documentary series on hypogonadism. He also collaborates with the Men's Health Network and has partnered with the pharmaceutical industry on clinical drug trials.

Yes, Dr. Tan treats both men and women. His clinical focus includes menopause management, Bioidentical Hormone Replacement Therapy for women, osteoporosis management, and weight loss. He takes the same individualized approach for female patients as he does for men dealing with hormonal changes.

Dr. Tan trained at the University of Texas and holds expertise across geriatric medicine, preventive medicine, and endocrinology. His career has focused on aging endocrinology and sexual health. He has spent nearly two decades building a nationally recognized practice in hormone replacement and age management.

Yes, Dr. Tan runs Phase 2 through 4 clinical drug trials at Opal Medical Clinic. Active research areas include erectile dysfunction, hypogonadism, and cognitive decline. Patients interested in participating can discuss eligibility directly with Dr. Tan during a consultation.

Patients consistently describe Dr. Tan as thorough, patient, and one of the most knowledgeable communicators they have encountered in men's health care. Many travel from outside Houston, including from Mexico and Canada, to receive care from him.