Hello,

Earning depends in location, local population. medical store near hospital/ hospital zone/ doctor streets makes more earning than located in locality.

In hospital zone, they might be making thousands in a day as many people come to buy medicine and they are in hurry so they won't prefer to go far and search.

In locality, they might be making below 10k.  Medical stores located in native place might be making very less money in daily basis as there is less hospital and doctors.

on an average, it will be 2-4thousand per day. it may change as per locality, season, situation, crisis and many other factor

Hope it helps!