My mother aged 65 is having high bp of nearly of range 130 to 140. She is using tab aten-25 every day one since 8 to 10 years. She is healthy and just need your opinion if she can change the tab to another company as we are not sure if she can use the same tablet for many years. She has little low pulse rate of 55 pulse for minute. We think using same tablet for many years may cause this. Please advice.