$CBIS The active ingredients in MDI inhalers are

$CBIS The active ingredients in MDI inhalers are dissolved or suspended in a propellant, a mixture of propellants, or a mixture of solvents and they are delivered via a compact pressurized aerosol dispenser. The dispenser can hold about several hundred metered doses of the medication. DPI inhalers contain the medication in a fine dry powder format and the medication is delivered to the lungs as the patient inhales through it. It contains the medication without any propellants. There are pre-metered DPIs which contain previously measured doses in blisters, capsules, etc. and they are inserted into the device during the manufacturing process or by the patient before use. The dose is inhaled directly from the pre-metered unit or it might be transferred to a chamber before being inhaled.

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