Hello, I've been taking Lotrel 5/20 for the past 5 years to control my hypertension. However, based on my latest blood pressure readings, I think I may need a stronger dose. My question is...how does the doctor determine which would be more effective for me: increasing my dose to 5/40 or increasing it to 10/20? Is there a rule of thumb to determine which of the meds in Lotrel should be increased? I thank you for your assistance.