Metered-Dose Inhalers Are Used to Deliver Specific Amounts of Medication

Metered-dose inhalers are used to deliver specific amounts of medication.The nurse gives the patient which of the following instructions?

A) Never shake the inhaler medication before use.
B) Exhale while squeezing the canister to deliver the medication.
C) Sit upright,exhale,then activate the inhaler as the next inhalation begins.
D) Hold the head back while inhaling the medication.