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In brief , after you are a B Pharm graduate and you are a registered pharmacist in India you have to apply to the FPGEC to appear in your FPGEE in order to become a foreign pharmacist in USA. This is the first step. Of course you have to clear TOEFL and TSE also as per their norms.
After you reach there and clear your FPGEE , you have some more exams to clear until you are a certified pharmacist there.