From Adam Tooze’s Shutdown:
Working with the property management companies that service China's private apartment complexes, enrolling millions of volunteers from the ranks of the party, they turned each compound into a lockdown zone.
The aim was to find infected people and quarantine them. As a helpful nudge, the authorities in Hangzhou banned pharmacies from selling pain-
killers. This would prevent citizens from self-medicating and force them to seek hospital treatment.
Wow. I did not know about that last measure.