Metoprolol ER 25 mg is a standard starting dose, but beta-blockers are typically not the first-line treatment for high blood pressure unless you have specific heart conditions, such as coronary artery disease or heart failure. Your blood pressure of 140/80 mmHg is slightly elevated, indicating your hypertension may not be fully controlled. Do not stop taking this medication suddenly, as doing so can cause a dangerous spike in your heart rate and blood pressure. I highly recommend consulting your doctor to review your treatment plan and discuss whether a medication adjustment or a different class of drug is more appropriate for you.