No data is collected. The app does not send any data over the internet. Your pill history is stored locally on your phone. No trackers are active in the app.
The only information collected is your My PrEP+ subscription history, anonymously by the revenuecat.com SDK. That's it. Other than that, no other information is collected. Your encounter history is stored locally on your phone.
To delete your data, tap "Clear all data" from the Settings tab in the app, or simply uninstall it.