Others may have other ways, and if you wish to narrow it down to a certain time you likely could, but probably best to keep it simple and just search through the whole thing. I have over 14 years of records and searched on fluoxetine and came up 77 entries in about 45 seconds.
Once in Reports it is:
Category: Notes and Encounters
Field: Any field (you can narrow this, but I would suggest doing every field the first time)
Operator: Contains (only choice)
Value: Your choice. Maybe put the whole word or possibly just a few letters depending.
Add criteria. Run report. When the reports come back, you can click directly on them to open charts or perform other commands on them.
