AMA Style: The Basics for Pharmacy Writing: The Merck Index

In your reference list, cite information from The Merck Index online using the "drug database (Lexicomp, CPS, etc.)" format:

Drug Name. In: (Specific database title). Publisher. Publication date (if available). Updated date. Accessed date. URL (no period after the URL)

Note: Sometimes the updated/published dates are not available.

Example: 

1. Salicylic Acid. In: Merck Index Online.  Merck Sharp & Dohme Corp.  Updated 2013.  Accessed January 23, 2020. https://www-rsc-org.proxy.lib.uwaterloo.ca/Merck-Index/monograph/m9739/salicylic%20acid%20derivative%20sodium%20salt?q=authorize