The use of multiple prescription drugs by a single patient, causing the potential for negative effects is called Inappropriate polypharmacy.
Polypharmacy may or may not be necessary. It may not be appropriate for a variety of reasons, such as prescribing more medications than necessary, medications with unfavorable side effects, or medications in combination that have negative drug-drug and drug-disease interactions.
A definition of polypharmacy that acknowledges the use of both appropriate and inappropriate pharmaceuticals would read, for instance, "polypharmacy extends from the use of a high number of medications to the use of possibly inappropriate medications, medication underuse and duplication."
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