Sir, My Doctor Suggest Eritel 20 To Control My Blood

Sir, My doctor suggest eritel 20 to control my blood pressure one tablet at night i was take for 12 days but Bp didn't come down before taking tablet my bp was 150/115 and now he suggests 2 tab. 1 at morning after breakfast and 1 after dinner since 3 days I'm taking 2 tablet a day but bp didn't control and my bp is 145/110 and some time 140/105 and morning time it's come 155/110,so please tell me how many days need to set a dose and hoe many tablet can person take per day.? My age is 45 year.