Turning green: the impact of changing to more eco-friendly respiratory healthcare. A carbon and cost analysis of Dutch prescription data.
Objectives Dry powder inhalers (DPIs) have a substantially lower global warming potential than pressurized metered-dose inhalers (MDIs). To help mitigate climate change, we assessed the potential reduction in CO2-equivalents when replacing MDIs by DPIs in the Netherlands, and estimated the associated cost. Design We performed a four-step analysis based on data from two national databases of two independent governmental bodies (Dutch National Healthcare Institute and the Dutch Healthcare Authority). First, we calculated the number of patients with Chronic Obstructive Pulmonary Disease (COPD) and asthma that were using inhalation medication (2020). Second, we calculated the number and total of daily defined doses of MDIs, DPIs, and soft mist inhalers and the number of spacers per patients, dispensed by non-hospital based pharmacies in 2020. Third, we estimated the potential reduction in CO2-equivalents (eq.) if all eligible patients (≥7 years old; COPD with ≤exacerbation per year) would switch from using MDIs to using DPIs as eco-friendly alternatives. Fourth, we performed a cost-effectiveness analysis. Results In 2020, 1.4 million patients used inhalers for COPD or asthma treatment. A total of 460 million defined daily doses (DDDs) from inhalers were dispensed, of which, after the exclusion of nebulisers, 50.4% were from MDIs. We estimated that this use could be reduced by 70% leading to annual reduction in emissions of 77 - 84 million kg CO2eq. saving at best EUR 49.8 million annually. Conclusions In the Netherlands, substitution of MDIs to DPIs for eligible patients is theoretically safe and in accordance with medical guidelines, while reducing emissions by 80 million kg.CO2eq. on average and saving at best EUR 49.8 million per year. This study confirms the potential climate and economic benefit of delivering eco-friendlier respiratory care.