In addition to checking the battery saving/optimization settings, please check the following:
Open the Settings menu on your Xiaomi device.
Tap 'Battery & performance' from Settings.
Tap Manage apps battery usage to save battery by turning off restricting background service of the Medisafe app.
Tap 'Choose apps' from 'Manage apps' battery usage'.
Tap Installed apps and choose Medisafe.
Tap No restrictions.
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