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.
digest - a periodical that summarizes the news. pictorial - a periodical (magazine or newspaper) containing many pictures. serial publication, serial, series - a periodical that appears at scheduled times. organ - a periodical that is published by a special interest group; the organ of the communist party. issue, number - one of a series published periodically; she found an old issue of the magazine in her dentist's waiting room. journal - a periodical dedicated to a particular subject; he reads the medical journals. review - a periodical that publishes critical essays on current affairs or literature or art.