Question

how many days supply is the following prescription written for?
take 1 to 2 tabs every 12 hr as need for anxiety #120.
15 days
30 days
45 days
90 days

Explanation:

Step1: Determine daily tablet - usage range

Since the medication is to be taken every 12 hours, there are 2 doses per day. The minimum number of tablets per dose is 1 and the maximum is 2. So, the minimum number of tablets per day is $2\times1 = 2$ and the maximum is $2\times2=4$.

Step2: Calculate the number of days' supply based on the total number of tablets

There are 120 tablets in total. To find the number of days' supply, we divide the total number of tablets by the daily - usage rate.
For the maximum daily - usage rate (4 tablets per day), the number of days' supply is $\frac{120}{4}=30$ days.
For the minimum daily - usage rate (2 tablets per day), the number of days' supply is $\frac{120}{2} = 60$ days. But we consider the maximum daily consumption for the shortest - duration supply which is what the question likely asks for in a standard context.

Answer:

B. 30 days