Adherence to (compliance with) drug treatment is important. However, only about half the people who leave a doctor's office with a prescription take the drug as directed. Among the many reasons people give for not adhering to drug treatment, forgetfulness is the most common.
Definition of periodical. 1  1 : periodic 1. 2  2a : published with a fixed interval between the issues or numbersb : published in, characteristic of, or connected with a periodical.
What is a Periodical? Anything that is published at regular intervals throughout the year such as a magazine, journal, or newspaper: Magazine: A magazine is a collection of articles and images about diverse topics of popular interest and current events.