Is "q.d." an acceptable abbreviation in medical prescriptions?

The abbreviation "q.d." stands for "quaque die," which means "once daily." However, it is not considered an acceptable abbreviation in medical prescriptions because it can lead to confusion with "q.i.d.," which means "four times daily." This potential for misinterpretation can have serious consequences in medication dosing and patient safety, leading to medication errors. Therefore, the preference is to avoid using "q.d." in favor of writing "once daily" out in full to ensure clarity.

The other options imply that "q.d." is acceptable in certain contexts or is standard practice, which does not align with current recommendations to enhance clarity and reduce the risk of errors in prescription writing. Using unambiguous terminology is essential in healthcare to foster effective communication among healthcare providers and ensure patient safety.