What is you normal blood pressure like?
are you taking any blood pressure medications?
okay, a blood pressure of 99 over 66 is not a major concern and can be normal for many people. However if your normal blood pressure is usually significantly higher, then this low blood pressure can be due to dehydration. I would recommend drinking plenty of fluids and electrolytes. Also if you have any dizziness or weakness, or if the BP drops lower than 90 over 60 even without any symptoms, you should see a doctor for evaluation.
i take lipitor