Ideally, your BP should be less than 130/80mmHg when on medication.
The most common reason for fluctuations in BP is due to user error in measurement. Measure your BP 3 times on every occasion, and discard the first reading. Take the average of last 2 readings and note it down. If this still crosses above-mentioned threshold on multiple occasions, we might need to increase the dose of your medicines
Next Steps
Do consult a General Physician for in-office BP measurement.
Health Tips
Look for verified resources from American Heart Association to learn the proper technique of measuring BP.