Hello Varsha,
As per the eligibility criteria for PhD course provided in their website you should have M. Pharm. degree with minimum 50% marks and should qualify GATE/GPAT qualification or PET (M.S. University of Baroda). To take up PhD in pharmaceutical area you should have a very good foundation in that area. However, since it is a PhD programme , it is up to the faculty or more importantly the guides/supervisors to decide whether they can admit a student from related fields . So I suggest you to directly reach out to them and see if you can be accepted.
All the best
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