Final answer:
The available amount of the drug, according to the standard formula, is 750 mg.
Step-by-step explanation:
To find the available amount of the drug, we need to determine how many milligrams (mg) of the drug are in the 5mL multi-dose vial.
According to the drug label, there are 150 mg per milliliter (mg/mL) in the vial.
Therefore, the available amount of the drug is 150 mg/mL x 5 mL = 750 mg.