I am 70 years old male, having hypertension for the past 5 years. the present pressure is 170 /80. I am from India. I am not over weight (BMI=24), not diabetic, and not having any other health problems. I am taking a balanced, low sodium diet, with varieties of fruits and vegetables rich in Potassium. initially i took Metlolar-25mg, once daily for 3 years and based on the cardiologist advise, I changed to Telmisartan-40mg once daily. The BP is not coming down. Shall i go for higher dose, or change to some other more effective and safe, hypertension drug?