Yes, you are eligible to apply for the Pharma.d course after B.Pharma, the eligibility conditions for this course are as following:

Eligibility:
The applicant should be a pass in B.Pharm. from an institution approved by the Pharmacy Council of India under section 12 of the Pharmacy Act.

Generally this program covers following topics:
harmaceutics.
Medicinal Biochemistry.
Pharmaceutical Microbiology.
Pharmacognosy & Phytopharmaceuticals.
Pharmaceutical Analysis.
Clinical Research.