Final answer:
After the first 8 hours of being prescribed a medication taken every 8 hours, a patient would have taken one dose, which is 75 mg.
Step-by-step explanation:
If a patient is prescribed to take 75 mg of medication every 8 hours for 7 days, after the first 8 hours, the patient would have taken 75 mg of the medication. The calculation is straightforward because the medication is to be taken in single doses of 75 mg each time, without any need for accumulation or division of doses across different time intervals.