Hello @Nick -
OpenEMR has multiple methods to document treatment that would be suitable for recording an IV dose. Some of them like the LBFs described, or Nation Notes or CAMOS are v versatile but require considerable setup. You can use Sherwin’s link to the LBFs, (thanks!) or go here to search the wiki for the other features if you wish.
https://www.open-emr.org/wiki/index.php?search=&title=Special%3ASearch&profile=default&fulltext=1
However, in my experience as a former nurse and doing OpenEMR customer support for several years, I’ve seen a lot of customers happy to use the native SOAP note clinical form, or the Patient Message feature. They both are immediately available in a standard OpenEMR install and are really useful.
The SOAP note is found in the menu of clinical forms that can be added to the encounter you’re working in at the moment.
You may add a SOAP note to the encounter to document the medication admin; click the SOAP menu item (rectangle above), fill out the standard SOAP note- or only the sections as you want. Click save at lower left
and it will appear in the encounter summary (round rectangle, 1st pic above)
Another documentation method would be to make a Patient Message in the pt’s record.
In the Dashboard, click on the Messages widget then on the link (round rectangle below)

You can select the type of message this is (the list is customizable so you could add ‘Med Admin’ if you wanted to) and who it’s directed to if anybody.

Enter the note and it will display in the dashboard ‘Messages’ widget panel.
Hope these ideas are useful!
Best- Harley