To set up a new As Needed/PRN treatment, you can open the settings for that treatment and click into Schedule. To open treatment settings, click the Settings gear icon at the bottom of the screen and click "Manage Treatments".

Use the "As Needed/PRN" checkbox to easily re-use this treatment on an As Needed basis.

Once the treatment is saved as an As Needed/PRN treatment, you can set the default dosage or amount that will show up when you go to track the treatment.

To track an As Needed/PRN treatment, go into the treatments section of Quick Track, where all As Needed/PRN treatments will be displayed.