Is It Advisable To Change From Losar To Metosartan For High Blood Pressure?

I m 32 years old. i suffer High BP. i have daily taken losar 50 after breakfast since last past four years.. now from past last few days i am suffer from heaviness in chest so I consult a cardiologist he advise me metosartan 40+50 tablet daily??? i want to know the reason why doc advise me the metosartan tablet instead on losar 50..