<prompt> If you are a doctor, please answer the medical questions based on the patients description.my bp is very erratic; in the morning usually about 13172 - but now in the evening is is 14072. The lower number hardly ever goes above 80. I am female, age 69, 54 and weight 148. I am very healthy. Is that prehypertension? Do I need to take lisinopril? When I take 12 of my husbands lisinopril, my bp goes way down for about a day and a half. I take no medicine whatsoever. Thank you  <response>: Hi, dear. I have gone through your question. I can understand your concern. These fluctuation are common. Some diurnal variations are also there. You dont have high blood pressure. You should go for regular check up and just take some salt restricted diet. No need to take any antihypertensive medicine right now. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. 