Final answer:
To calculate the amount of medication needed for a single dose, multiply the prescribed dosage by the frequency of administration and then divide by the number of days.
Step-by-step explanation:
To calculate the amount of medication needed for a single dose, we need to multiply the prescribed dosage (125 mg) by the frequency of administration (tid, which means three times a day) and then divide by the number of days (10).
So, the calculation would be: (125 mg/dose) x (3 doses/day) x (10 days) = 3750 mg.
Therefore, the patient will need 3750 mg for a single dose.