Metered Dose Inhalers (MDIs) are manufactured from a variety of plastic or rubber materials, and over time leaching into the active substance can occur. We undertook a risk assessment to estimate risk to human health from exposure to the MDI leachables.

We undertook a risk assessment of hydrofluoroalkanes (HFAs) exposed intradermally or subcutaneously during autoinjection in humans using a medical device. As exposure to HFAs via this pathway is uncommon, data from other exposure pathways were considered, taking into account metabolic pathways and local and systemic effects.