Accessibility is the degree to which a medicine is obtainable for those who need it at the moment of need with the least possible regulatory, social, or psychological barriers.
A measure of the ease with which a specific population can obtain appropriate health services and be served by facilities within the health care system.
The concept is used to detect inequity in the availability of health services for different populations defined geographically, socially, or in terms of their race, ethnicity, gender, or clinical condition.