A 58-year-old man presented to the hypertension clinic for routine follow-up because of persistently elevated blood pressure despite treatment. He had an 8-year history of hypertension and type 2 diabetes mellitus diagnosed 5 years earlier. Initially, his blood pressure had been adequately controlled with telmisartan monotherapy; however, over the preceding year, both clinic and home blood pressure readings had progressively increased despite confirmed medication adherence and lifestyle modification. His medical history included dyslipidemia and obesity (body mass index 31 kg/m²). On examination, his blood pressure was 164/96 mmHg on repeated office measurements, with home blood pressure readings averaging 162–166/94–98 mmHg over the previous two weeks. His heart rate was 72 beats/min. Laboratory investigations demonstrated an estimated glomerular filtration rate (eGFR) of 82 mL/min/1.73 m², serum potassium of 4.4 mmol/L, glycated hemoglobin (HbA1c) of 7.2%, and persistent moderately increased albuminuria. Electrocardiography showed left ventricular hypertrophy, while fundus examination revealed mild hypertensive retinopathy. Evaluation for secondary causes of hypertension was unremarkable. His current medications included telmisartan 80 mg once daily (maximum approved dose), metformin, atorvastatin, and low-dose aspirin. Despite receiving the maximum approved dose of telmisartan, his blood pressure remained above target, prompting consideration of combination antihypertensive therapy in accordance with current hypertension guidelines.