If blood pressure is still 147/87 even being on lisinopril 20 mg once daily, should i be concerned?

That is : Considered uncontrolled high blood pressure by definition. You may need to restrict your salt intake along with taking your blood pressure daily and recording them in a log to bring to the healthcare provider. If you drink alcohol or smoke cigarettes then please consider quitting. And losing weight will always help lower the blood pressure.

Good BP on Rx?: This depends on many factors that you and your Dr. need to discuss. 1. Is your BP device accurate? 2 Are the BPs taken by your Dr. accurate-many are not. 3. Other problems including heart disease, diabetes, kidney disease. 4. Why do they think your BP is high? 5. Most people should expect to need 2 BP meds to get to goal 6. Are you eating too much salt. 7. Look at DASH eating plan to lower BP.