India does not recognize patents on medicine.
See, for example: India: Patents And The Indian Pharmaceutical Industry [1]
> With regard to pharmaceuticals, in the case of substances intended for use or capable of being used as food, drugs or medicines or substances produced by chemical processes, patents are granted only for the processes of manufacture of such substances and not for the substances themselves. Hence, pharmaceutical products are currently not granted patent protection under Indian law.
(And note that the "process of manufacture of such substances" is in practice interpreted so tightly that it covers very little.)
[1] https://www.mondaq.com/india/patent/865888/patents-and-the-i...