| Name | Info | Provider | Link |
|---|---|---|---|
| Pain Relievers | free resource | MedlinePlus Health Information | https://medlineplus.gov/painrelievers.html |
| subscription/membership/fee required | Wiley | https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0022-3573&date=1998&volume=50&issue=1&spage=19 | |
| subscription/membership/fee required | Silverchair Information Systems | https://academic.oup.com/jpp/article-lookup/doi/10.1111/j.2042-7158.1998.tb03300.x |