I was wondering about Kerala's situation. RE ivermectin, I tracked down Indian state government roll-outs of in April and May and the coincide with the reversal of the waves in most cases. Kerala's guidelines also recommended ivermectin in April 25, and only counter-indicated for children and pregnant women - https://dhs.kerala.gov.in/ജാഗ്രത-നിര്%E2%80%8Dദേശങ്ങള്%E2%80%8D/ - yet the reversal of the wave (which was later than in other states embracing ivermectin) stalled.

If there was a ban, it's weird that it is not reflected in the guidelines (like happened in Tamil Nadu on May 7).

Could be the vaccines, or the remdesivir (also included in April 25 treatment guidelines). Or they're just having supply chain issues with ivermectin due to being at the bottom of the subcontinent.