Databases usually tell you the titles they cover. Use those lists to identify publications and check if publications will be easy for your audience to find.
This page has tips for several example databases:
PubMed is one of the most common databases for health topics. It will be easy for people to find your article if you publish in one of the journals it includes.
You can identify some potential journals by searching for articles similar to the article you want to write. The citation information will tell you which journals publish that kind of article.
To check if PubMed includes a specific journal:
Embase is another database that is useful for most health topics. MCPHS accesses Embase on Ovid's platform.
CINAHL specializes in nursing topics and includes articles related to other health disciplines, such as dental hygiene.
To check if CINAHL indexes a specific publication:
APA PsycINFO specialized in psychology topics. MCPHS accesses APA PsycINFO on Ovid's platform.
To check the publications that PsycINFO indexes: