Answer :
Final answer:
To calculate the percent strength of dexamethasone sodium phosphate, divide the amount of the medication by the total volume of the solution and multiply by 100. Assumptions are made for the volume of drops, and the same calculation is applied for each part of the prescription.
Explanation:
To calculate the percent strength of dexamethasone sodium phosphate in the prescription, we need to know the total amount of dexamethasone sodium phosphate in the 100 mL solution. Since the prescription states Dexamethasone Sodium Phosphate 100 mg Sterile Water for Injection ad 100 mL, we know that the entire 100 mL contains 100 mg of dexamethasone sodium phosphate. To calculate the percent strength, we divide the amount of dexamethasone sodium phosphate (100 mg) by the total volume of the solution (100 mL) and multiply by 100. Using the given information, we can calculate the percent strength for each part of the prescription. For the first part (2 drops into eyes q 4 hours 2 days), we need to know the volume contained in 2 drops. Let's assume that 1 drop has a volume of 0.05 mL. So, two drops would be 0.1 mL. To calculate the percent strength, we divide the amount of dexamethasone sodium phosphate (100 mg) by the total volume of the solution (100 mL) and multiply by 100. For the second part of the prescription (2 drops q 6 hours 4 days), we follow the same process as before. We assume that 1 drop has a volume of 0.05 mL. So, two drops would be 0.1 mL. Again, we divide the amount of dexamethasone sodium phosphate (100 mg) by the total volume of the solution (100 mL) and multiply by 100 to calculate the percent strength.
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