What does the abbreviation "qs" stand for?

The abbreviation "qs" stands for "quantity sufficient." In the context of pharmacy and medication preparation, it is commonly used in prescriptions and formulations to indicate that a sufficient amount of a substance should be added to achieve the desired final volume or concentration. This instruction helps pharmacists understand that they should add ingredients until the mixture reaches a specific endpoint, ensuring the medication is prepared accurately and effectively. This abbreviation is vital in compounding and ensuring that medications are dosed correctly for patient safety and efficacy.