Drug Prescribing: Polypharmacy and Deprescribing.

Polypharmacy, defined as concurrent use of five or more drugs, can occur in patients of all ages. Polypharmacy may be appropriate or inappropriate. Appropriate polypharmacy is defined as "use of the correct drugs under appropriate conditions [in order] to treat the right diseases." A prescribed drug becomes inappropriate when its benefits no longer outweigh its risks. Inappropriate polypharmacy has been shown to increase the risks of hospitalization, adverse drug events, clinically relevant drug interactions, and all-cause mortality. Many tools are available to aid physicians in identifying inappropriate polypharmacy. Implicit tools, such as the Medication Appropriateness Index (MAI), provide guidance to be used alongside clinical judgement. Explicit tools, such as the American Geriatrics Society (AGS) Beers Criteria, provide lists of potentially inappropriate drugs and recommend alternatives. Collaboration with pharmacists is important in assessing drug appropriateness. It has been shown to reduce drug-related problems, emergency department visits, and hospitalizations and to improve overall patient health. A patient-centered, team-based approach is recommended in the process of deprescribing inappropriate drugs. Deprescribing should be approached in the same stepwise manner as prescribing of new drugs, and should include patient agreement to changes, evidence-based rationales, and use of dosage tapering strategies.