Which of the following statements is true concerning the use of dry-powder inhalers?
a. Propellants are used to help deliver the drug.
b. The carrier substance is usually lactose or glucose.
c. Laminar flow is necessary to create the aerosol.
d. Patients must breathe slowly and deeply during administration.
ANS: B
The carrier substance is usually lactose or glucose. Turbulent flow is a function of the ability of the patient to inhale the powder with a sufficiently high inspiratory flow rate. Propellants are not used in dry-powder inhalers.
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Fill in the blank(s) with the appropriate word(s).