What is the definition of polypharmacy?

Polypharmacy is defined as the concurrent use of multiple medications by a patient. This situation commonly arises in patients with chronic conditions who may be prescribed several medications to manage their various health issues. While it is not uncommon for patients to be on multiple medications, polypharmacy can lead to problems such as drug interactions, increased risk of side effects, and difficulties in maintaining adherence to medication regimens.

The other definitions provided do not accurately capture what polypharmacy entails. For instance, using medications in excess of the prescribed amount refers to misuse or overtreatment rather than the idea of multiple concurrent medications. A patient taking medications only as needed describes a "PRN" medication regimen, which does not involve polypharmacy. Finally, timing medication doses closer together for effect is more about dosage scheduling rather than the number of medications being taken at one time. Thus, the definition that aligns with the concept of polypharmacy is the concurrent use of multiple medications by a patient.