Advantages of the dry powder inhaler (DPI) drug delivery systems include which of the follow-ing?
1. Low relative cost
2. No propellants required
3. No hand-breath coordination necessary
4. Unaffected by humidity
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: B
DPIs are relatively inexpensive, do not need propellants, and do not require the hand-breath co-ordination needed for pressurized metered dose inhalers.
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