To describe the natural history of a condition or disease. To describe the natural history of a condition or disease. To determine effectiveness or cost effectiveness of treatments/services and/or health care products. To measure or monitor safety and harm. To measure quality of care.
According to the NMSS, attacks or flare-ups of symptoms only qualify as exacerbations if: 1  they occur at least 30 days from an earlier flare-up. 2  symptoms last for 24 hours or longer.
How long does Cialis last? In most people, Cialis lasts for about 36 hours. There are a number of factors that can increase or decrease how long Cialis lasts. Some factors that increase the amount of time Cialis stays in the body include severe kidney disease and certain medicines.