I was given a prescription for 5mg Lisinopril a couple of days ago. My normally low blood pressure (110/60) was running a bit high for a couple of months (135/88 and up to 145/90). I went to my cardiologist, BP was 145/88, hence he started prescription. I picked up prescription the following day, checked BP prior to taking pill..bp was 118/70...I had an appointment with GP later in the morning and bp was still 117/70 so I asked if I needed bp meds. She advised to start Lisinopril as bp fluctuates. I took one and the following morning, my bp was 90/68. It remained under 120 the entire day. Should I not take the pill, take full dosage or cut it in half or should I wait to see what bp does over the rest of the weekend and follow up with cardiologist on Monday?