Ordered: Erythromycin Base Filmtab 250 mg #28; take 1 tab po q6h. What is the days' supply?

Calculation: Total tablets = 28 tablets. Calculate the number of tablets to be taken per day. The order is to take 1 tablet every 6 hours ("q6h"). Number of doses per day = 24 hours / 6 hours/dose = 4 doses per day. Since each dose is 1 tablet, the patient takes 4 tablets per day. Calculate the total days' supply. Days' supply = Total tablets / Tablets per day = 28 tablets / 4 tablets/day = 7 days.