What does 'QD' indicate regarding medication dosage?

The abbreviation 'QD' stands for "quaque die," which is a Latin term that translates to "once daily." This indicates that the medication should be taken once every day. In medical prescriptions and documentation, using 'QD' helps healthcare professionals communicate the frequency of medication administration clearly and concisely. This is vital for ensuring patients adhere to their medication regimens as prescribed, thus promoting effectiveness and safety in treatment.

The other options represent different frequencies of medication administration. "Once a week" denotes a clear deviation from daily dosing. "Twice a day" indicates a more frequent dosing schedule that does not align with the meaning of 'QD.' "As needed" suggests that the medication can be taken at the discretion of the patient, differing significantly from the structured daily regimen that 'QD' specifies.