What does “indication” mean here?
The package insert of a medication has an “Indications and usage” section with information about who the medication has been approved for (who it is “indicated” for). An indication is usually defined based on both the specific medical problem and the group of people who used the medication in research. Some medications have only been approved for certain forms of a disease and only in certain groups of people, such as women, men, children or adults.
One medication can sometimes be used for more than one medical condition or in more than one group of people, for example in both children and adults. New medications are often only approved for specific forms of a disease and a certain group of people at first. After that, the manufacturer can apply for separate licenses for other forms of the disease and other groups of people (in other words, for other indications).
When doctors prescribe medication to be used in officially approved indications, it is sometimes referred to as “on-label use.”