If a patient takes 0.

To determine the dose conversion IV to PO, the ratio of PO to IV needs to be determined, this is 7.5 / 1.5 which is 5. This number means that the PO dose is 5 times more than the IV dose to get the same amount of drug into the bloodstream. If the patient is taking 0.5 mg IV then the PO dose would be 0.5 mg multiplied by 5, which is 2.5 mg. Since the patient is taking the medication every 4 hours the patient is receiving 6 doses, 24hrs/4hrs = 6. Since the patient is receiving 2.5 mg every dose and is receiving 6 doses a day, the patient is receiving 15 mg, 2.5 mg multiplied by 6 doses.