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Added value of centralised compounding of vaccines against SARS-CoV-2 in Hospital Pharmaceutical Services – a quantitative analysis

European Statement

Production and Compounding

Author(s)

Rui Relvas, Rui Pedro Marques, Ana Castro, Sérgio Nobre, João Paulo Lopes da Cruz

Why was it done?

Medicines compounding by the HPS-staff is a primordial activity, and its centralisation allows several benefits in levels such as patient safety, quality, efficiency, and pharmacoeconomics. Despite this recognised importance, it is not always possible to quantify its added value. The fact that vaccines against SARS-CoV-2 are supplied in multi-dose vials and the need to prepare and assure enough doses to vaccinate a broad population presented itself as an excellent opportunity to analyse such indicators.

What was done?

A quantitative analysis of the importance and added value of centralised preparation and compounding of vaccines against SARS-CoV-2 at the Hospital Pharmaceutical Services’ (HPS) Compounding Unit from a Central Hospital in Portugal.

How was it done?

Between 27th December 2020 and 2nd August 2021, 13.030 doses were prepared (96.9% Pfizer/BioNTech; 3.1% AstraZeneca). At the first 3 vaccination sessions, multi-dose vials were diluted at the HPS, and each syringe measured by the nursing-staff previously to the administration.
After these initial sessions, each dose started to be individualised by the HPS-staff on pre-filled, ready-to-use syringes. Each vaccine dose was individualised on a horizontal laminar flow cabinet according to a previously approved operational procedure.
Reception, preparation, and dispensation records were retrospectively analysed. Key performance indicators were quantified.

What has been achieved?

During the first 3 sessions of vaccination, when nursing-staff measured each vaccine volume, a total of 1640 doses were administered. However, it would be possible to measure a total of 1932 doses (84,9%). The daily maximum of people vaccinated was 770.
In the following sessions was possible to prepare 11.390 doses, with a theoretical maximum of 10.892 (104,6%) and a daily maximum of 1.113.
This yield, over 100%, allowed an excess of 498 doses, which translated into the vaccination of 249 extra individuals fully vaccinated with the 2 doses. Factors like needle and syringe selection and preparation beyond an aseptic and validated environment contributed for the yield increase.

What next?

Series-production of compounded medicines in a sterile, validated, and controlled environment allows important benefits and this analysis shows the potentiation of every key performance indicator considered. These data should be considered for the future planning of population-wide activities involving the massive preparation of sterile medicines.

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