<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, may I answer your health queries right now ? Please type your query here...I am monitoring my bp from home. I am currently getting two different readings. First reading is 14074. Second reading 2 minutes later is 11674. Im taking 5 mg of lisinopril daily. My concern: If my bp is really the second reading will taking the lisinoril cause my bp to drop too low? NOTE: My bp machine was checked for accuracy about a month ago.  <response>: Hello, Lisinopril does decrease BP, but this much fall within minutes is unlikely. Either of two readings is false. You should take the third reading in order confirm which is one is right. 5-10 MMH variation is acceptable. Also, if you bent or tighten the arm or doing some activity with hand during may affect the readings. So this is fallacy of electronic apparatus, we need to take multiple readings. Hope this helps you and get back if you have any doubts. 