Which abbreviation is commonly discouraged due to misinterpretation risks?

• A. q.d./qd (every day)
• B. q.i.d. (four times daily)
• C. NPO (nothing by mouth)
• D. PRN (as needed)

Answer: (A)

Misinterpretation risk in medication abbreviations can lead to dangerous dosing errors. The daily dosing notation q.d. (or qd) is commonly discouraged because it can be misread as something different—handwriting or unclear punctuation can make it look like q.i.d. (four times daily) or even be read as a decimal-like entry. That mix-up could cause a once-daily prescription to be administered four times a day, risking an overdose over time. To prevent this, clinicians are taught to write out “daily” or “every 24 hours” instead of using q.d./qd. The other options—nothing by mouth and as needed—are generally clear and carry less risk of misinterpretation, though it’s always best to spell things out when possible.