What does the abbreviation "ss" with a line over it signify?

The abbreviation "ss" with a line over it signifies "one half." This notation is commonly encountered in medical and pharmaceutical contexts, particularly when prescribing medication doses. The symbol is derived from the Latin word "semis," which means half. Therefore, when you see "ss," it indicates that the prescribed dose is to be reduced to half of the standard amount.

This helps ensure that patients receive an accurate dosage, especially in cases where a full dose may be inappropriate due to specific medical conditions or other factors. Understanding this abbreviation is crucial for medication administration, as it directly impacts patient safety and the effectiveness of treatment.