Type: Abbreviation Definitions: 1. Abbreviation for L. quantum sufficiat or satis, as much as suffices.
q.s.: On a prescription, as needed.
abbreviation for Latin quan´tum sa´tis (sufficient quantity). Used in prescription writing.
As much as suffices (from Latin quantum satis or quantum sufficit)
quantum sufficit, q.s. As much as suffices. A term used on medical prescriptions to indicate that as much of a certain component should be used as is sufficient, a decision left to the pharmacist.
(in prescriptions) as much as is sufficient; enough. · See