Extensive Deep Vein Thrombosis in a Young Man Taking Tirzepatide for Weight Loss.

BACKGROUND/OBJECTIVE: Obesity and rapid weight loss are risk factors for developing deep vein thromboses (DVTs). Our aims were to present a patient who developed extensive DVT after relatively rapid and severe weight loss that followed taking tirzepatide and to raise the awareness among health care professionals regarding the risk of DVT that can be associated with significant weight loss due to these agents. CASE REPORT: We present the case of a 20-year-old young man, with raised body mass index of >35 kg/m, who was initiated on tirzepatide treatment for weight loss, with 12-kg weight lost over 6 weeks. The patient did not have any risk factors for thrombophilia including family history, any recent travel, immobilization, recent infections, or recent surgeries. He presented with left leg swelling, and physical examination revealed signs of proximal DVT, and ultrasound Doppler and computed tomography venography confirmed extensive left-sided DVT with complete obstruction of the common femoral and iliac veins. He underwent mechanical thrombectomy and was maintained on anticoagulation therapy. His investigations for thrombophilia screening excluded any other cause for DVT, with the etiology attributed to possibly rapid weight loss. DISCUSSION: Newer and potent glucagon-like peptide 1 receptor agonists like tirzepatide are commonly used nowadays to induce weight loss in obese patients. CONCLUSION: Adequate risk assessments and close monitoring should be performed in patients initiating glucagon-like peptide 1 receptor agonists, particularly if they have risk factors for developing venous thromboembolism.