2022 Volume 24 Issue 2 Pages 88-97
Objective: Drugs that are excreted by the kidneys may require dose adjustments, depending on the patient’s renal function. The pharmacist must ask the prescribing physician about the prescription if a dose is deemed inappropriate. In the current study, we investigated the economic effects of prescription questions associated with renal function and the antibiotics treatment completion rate.
Methods: The current study included inpatient prescription inquiries by pharmacists at our institution between January and December 2018. For all cases that were inquired prescription, the economic effects were estimated as follows; the drug costs were calculated based on drug prices at April 2018 edition, and the reduced medical care costs associated with avoiding adverse reactions due to prescription questions were calculated based on the number of benefits and the total cost of benefits in the Relief System for Sufferers from Adverse Drug Reactions. The antibiotics treatment completion rates were calculated based on the number of cases in which drug and dose maintained after prescription questions.
Results: The study included 279 cases, 266 of which involved inappropriate doses due to deteriorated renal function. Most prescriptions were for antibiotics. The drug costs were reduced due to the prescription question in 213 cases; the total reduced cost was 699,483 Japanese yen. The economic effects associated with avoiding adverse reactions due to prescription questions were worth approximately 11,481,056 Japanese yen. The completion rate of antibiotic treatment in cases where doses were reduced due to prescription questions was 63.0% (treatment of 75 cases completed/all cases were 119), compared with 63.6% (7 cases/11 cases) in cases in which doses were not changed. Thus, dose reduction due to questions regarding the prescription did not lead to reduced completion rates of antibiotics treatment (p=0.621).
Conclusion: Dose adjustments due to prescription questions about drugs excreted by the kidneys led to reduced drug costs and adverse reactions, and did not result in negative effects during infectious disease therapy.
