How Accurate Are Those Blood Pressure Machines At Your Local Pharmacy ? I rarely worry about my blood pressure and normally only have it checked twice a year (at the local VA clinic), but last Sunday I was at a local Rite Aid Pharmacy with a friend and decided to use their free blood pressure machine. The first reading was 138 over 67 (heart rate 69). That didn’t sound right so I waited a minute and did it again. The second reading was 107 over 68 (heart rate 63). I did it a third time and the reading was 99 over 63 (heart rate 60). Should there have been so much variance within results within a few minutes time? Could your blood pressure drop 40 points in just a few minutes time? Could the machine be giving false readings? It s hard to pick a best answer here because the replies run in every dirrection. So please don t feel slighted if your replie isn t selected.