The invention relates to a known metering device (1) for at least one medium. Said device comprises a pump unit (2), which co-operates with a medium reservoir for the delivery of said medium and an aeration device that is allocated to the medium reservoir and/or the pump unit. The aeration device comprises an aeration channel (16, 18, 26, 27), to which a filter membrane (20) is allocated. According to the invention, the filter membrane is configured for a reduced diffusion rate. The device can be used for metering pharmaceutical products.
展开▼
