There are several ways to narrow or limit your search results. To the left on the search results page is a list titled Results Filters.
These include related drugs, diseases, devices, and subheadings.
Also, you can limit results by age, gender, and by type of study and publication.
Click on the title of the Filter (e.g., Age) and then check the relevant boxes. When done, click on the Apply box at the bottom of the list.