Questions: 11. A physician orders metformin 1 g bid for a patient newly diagnosed with type 2 diabetes mellitus. A new stock bottle of 500 metformin 500 mg tablets is used. - How many tablets remain in the stock bottle after the prescription is filled?

To determine how many tablets remain in the stock bottle after the prescription is filled, we need to follow these steps:

1. Understand the Prescription: The physician has ordered metformin 1 g (1000 mg) to be taken twice a day (bid). This means the patient needs 2000 mg of metformin per day.

2. Determine the Number of Tablets Needed Per Day: Since each tablet is 500 mg, the patient will need: \[ \frac{2000 \text{ mg}}{500 \text{ mg/tablet}} = 4 \text{ tablets per day} \]

3. Calculate the Total Number of Tablets for the Prescription: The problem does not specify the duration for which the prescription is written. However, if we assume a common prescription duration, such as 30 days, the total number of tablets needed would be: \[ 4 \text{ tablets/day} \times 30 \text{ days} = 120 \text{ tablets} \]

4. Determine the Remaining Tablets in the Stock Bottle: The stock bottle originally contains 500 tablets. After filling the prescription, the number of tablets remaining would be: \[ 500 \text{ tablets} - 120 \text{ tablets} = 380 \text{ tablets} \]

Therefore, after the prescription is filled, 380 tablets remain in the stock bottle.