Drug Calculations Practice NCLEX Questions (100+ Items) - Nurseslabs D = Desired dose or dose ordered by the primary care provider. H = dose on hand or dose on the label of bottle, vial, ampule. V = vehicle or the form in which the drug comes (i.e., tablet or liquid). STANDARD FORMULA Formula = \frac {Desired (D) \times Vehicle (V) } {On\ Hand (H)} = amount \ to \ administer Example: Order: Acetaminophen 500 mg