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Sustainability initiative: dose banding of paclitaxel to minimise drug waste

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European Statement

Production and Compounding

Author(s)

Peder Nygard, Helle-Brit Fiebrich-Westra, Elise Smolders

Why was it done?

The aim of this project was to reduce paclitaxel waste caused by cancellation of administrations. Standardised dose bands make interchangeability of already reconstituted paclitaxel bags easier, as more patients use the same dose. This could potentially save drug- and material waste and costs even as manpower.

What was done?

Paclitaxel fixed dose bands were created for patients treated with a weekly dose of 80 mg/m2.

How was it done?

In consultation with prescribers the dose bands for paclitaxel where created (see table). These dosages were implemented as a dose-rounding rules in the drug preparation software (Hix 6.2, ChipSoft BV). The maximum deviation for dose-rounding rules for paclitaxel in our hospital is 10% of the prescribed dose. Dosage ≤72mg or >200mg were rounded as normal.

Prescribed dose (mg) Dose-band (mg) m2 (dose 80 mg/m2
>72 ≤88 78 1.0
>88 ≤102 96 1.2
>102 ≤116 114 1.4
>116 ≤136 126 1.6
>136 ≤152 144 1.8
>152 ≤168 162 2.0
>168 ≤184 174 2.2
>184 ≤200 192 2.4

What has been achieved?

These rules were implemented in April 2022. Data from 1 May 2022 to 31 August 2022 is compared with the same time period in 2021. In 2022, a total of 729 infusions where prepared compared with 872 infusions in 2021.
In this 4 month time period in 2022 a total of 14 different dosages were prescribed, compared with 24 in the same time period in 2021. Additionally, interchangeability was improved as the top 3 dosages prepared by the pharmacy were: 144 mg (36%), 162 mg (22%), and 126 mg (19%) compared with 144 mg (17%), 138 mg (14%), and 126 mg (10%) in 2021.
Furthermore, in 2021 we discarded 33 prepared dosages of paclitaxel of which three infusions could be reused. Compared to 13 discarded dosages in 2022 of which eight were reused giving a reduction of 25 infusions less waste (83% reduction, savings ~2500 euros).

What next?

Pharmacists need to be instructed to adapt these rounding rules, which must decrease the variation in dosages and thus waste. Secondly, this project will be monitored the upcoming year and evaluated together with prescribers. The aim is to implement dose bands for paclitaxel dosages 175 mg/m2 and other chemotherapeutic drugs (eg, oxaliplatin, docetaxel, cyclophosphamide).

Implementation of dose banding strategy for Daptomycin

European Statement

Production and Compounding

Author(s)

Marta García-Queiruga, Begoña Feal-Cortizas, José María Gutiérrez-Urbón, Andrea Luaces-Rodríguez, Alejandro Martínez-Pradeda, Sandra Rotea-Salvo, Carla Fernandez-Oliveira, Víctor Giménez-Arufe, Luis Margusino-Framiñán, Isabel Martín-Herranz

Why was it done?

Daptomycin is an intravenous antibiotic usually prepared in Hospital Pharmacy services. Normally it is dosed based on body weight, which requires each intravenous mixture to be prepared in an individual manner for each patient. This might lead to an increased assistance workload in elaboration areas, a higher number of errors in the preparation and high costs due to waste materials generated during preparation.

What was done?

The aim of this study is to describe the preparation of intravenous daptomycin by dose banding, a system in which daptomycin doses are rounded up or down in order to standardize and protocolize the preparation of intravenous mixtures as much as possible.

How was it done?

In order to improve this situation, dose banding strategy was implemented in February 2019: the obtained final dose was rounded in such a way that only mixtures of 500, 700 and 850 mg were prepared (in agreement with Hospital Pharmacy and Infectious and Microbiology medical teams) , following this scheme:
PRESCRIBED DOSE PREPARED DOSE
< 400 mg Prescribed dose (individualized) 400–599 mg 500 mg ≥600–799 mg 700 mg ≥800 mg 850 mg

What has been achieved?

Previous year before starting dose banding strategy (2018), 5493 individualized doses of daptomycin were prepared for 437 patients in our Pharmacy service. Between June 2020 and June 2021, 2680, 2555 and 997 units of daptomycin 500, 700 and 850 mg, respectively, were prepared for 360 patients. Batches of standardized doses were prepared in advance and kept refrigerated (stability of 10 days in 100 ml of physiological saline) until dispensation. In addition, during the same period, 15 patients (4 from pediatrics) received 209 individualized doses (3.2% of the total doses) due to their low body weight.

What next?

This strategy might decrease the number of errors in preparation and reduce processing times, which is essential since early appropriate antibiotic treatment in severe infection has been associated with better outcomes. Dose banding model could be extrapolated to other drugs with good physical, medical and microbiological stability in dilution, which are frequently prescribed and when few dose bands can cover most of the prescriptions.

IMPLEMENTING CHEMOTHERAPY DOSE-BANDING USING RETROSPECTIVE DATA ANALYSIS AND EXPONENTIAL CALCULUS

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European Statement

Production and Compounding

Why was it done?

Chemotherapies are generally prescribed and produced as a function of Body Surface Area (BSA). The most recent literature recommends that marketed drugs continue to use BSA-based dosing supported by clinical evidence. If not, it recommends DB with adjustments for other important parameters.

What was done?

Determine which of the drugs compounded in our centralised chemotherapy production unit were potential candidates for dose banding (DB) for adults, whilst guaranteeing patient safety and meeting the needs of physicians, pharmacists and nurses.

How was it done?

The database of chemotherapy doses produced between 2010 and 2013 was analysed to define a Top 10 chart of the most common protocols and compounds. Dosage patterns were analysed and new bands were modelled using exponential calculus in order to aid in DB decision-making. Discussions with interdisciplinary teams and senior physicians took place in order to promote acceptance of the project and its deployment.

What has been achieved?

Oncology professionals requested an integration of bands into the electronic prescription system, the possibility to prescribe doses above those suggested using BSA and a maximum 5% margin of difference to the usual prescribed dose. They highlighted the necessity of maintaining “ready for administration” doses. For example, in 2013, 613 infusion bags of gemcitabine were produced in 111 different doses, ranging from 266 to 2900 mg. Following the new specifications, just two bands (2000 mg and 1805 mg) already fulfil 50% of annual production needs; producing five band doses streamlines 90% of annual production needs.

What next?

Chemotherapeutic doses can now be prepared in bands and the pharmacy activity can be rationalised by producing doses in batches. The imminent introduction of automation should ensure accuracy of the doses delivered. Future studies should examine product stability so that chemotherapy production planning becomes highly efficient.

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