My mother is taking atenolol 25mg for elevated blood pressure, but is giving her a lot of unpleasant side effects as, blurred vision, dizziness, lightheaded, weakness, and sudden drop in blood pressure down to sometimes 90/ 50. She spoke to her doctor about this and maybe changing the medication but the doctor said that her complaints were not related to this medication. Can you recommend another medication that would not give her these side effects.