hi,

see you are asking about two different courses, which curriculum , area of studies, job prospect , work nature is different to each other. bachelor in computer application is considered as software oriented course, which has mathematics, computer fundamentals, programming languages in syllabus. the course is ideal for those who are interested in learning programming, computer software and want to work in corporate sectors. where bachelor of pharmacy is 4 years duration course, has main course of chemistry and biology, drugs structure, effects on human body.

the both of the course is different and have excellent career growth, however which of the field you may go it is necessary to do master degree like  mca after bca and m.pharma after b.pharma to get better career scope.

All the best !