Introduction: This study aimed to survey patients on polypharmacy regarding their own intention and inclination to reduce medication use, and their subjective understanding of drug effectiveness and side effects. We aimed to contribute to the establishment of an information base to address polypharmacy.Methods: We enrolled 100 adult patients who had been admitted and administered ≥ 5 oral medications. A questionnaire was utilized to assess their willingness and inclination to reduce their medications, as well as their subjective understanding of drug effectiveness and side effects.Results: Sixty-two patients expressed an intention to reduce their medication use, citing reasons including medication management, drug combinations, and side effects. The proportion of patients with this intention increased as the number of prescribed medications increased. Of the 38 individuals who responded that they had no intention of reducing their medication, 21 (55.3%) cited the reason as being that they received the prescription from a physician. The level of understanding about the effectiveness of their own medications was significantly lower among those aged ≥ 75 years. However, the level of understanding of side effects did not vary based on age or number of prescriptions.Conclusion: To promote the optimization of prescriptions, it is necessary to ascertain patients' intentions, and the relationship between patients and prescribing physicians.