Name Info Provider Link
Pain Relievers free resource MedlinePlus Health Information https://medlineplus.gov/painrelievers.html
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=22337080.ui
subscription/membership/fee required Wiley https://doi.org/10.1002/j.1532-2149.2011.00034.x