Final answer:
To find the volume needed for one dose of the prescribed medication, a simple proportion can be used. The prescriber ordered 45 milligrams and the drug's concentration is 15 milligrams in 0.25 milliliters, so 0.75 milliliters should be administered per dose.
Step-by-step explanation:
The prescriber has ordered a medication to be administered at a dosage of 45 milligrams once per week for 8 weeks. After reconstitution, the medication has a concentration of 15 milligrams in 0.25 milliliters.
To determine how many milliliters are needed for one dose, we can set up a simple proportion:
15 mg : 0.25 mL = 45 mg : x mL
By cross-multiplying and solving for x, we get:
(15 mg) * (x mL) = (45 mg) * (0.25 mL)
x = (45 mg * 0.25 mL) / 15 mg
x = (11.25 mL) / 15
x = 0.75
Thus, you will need to administer 0.75 milliliters to the patient in one dose.