If I want to be a pharmacist should I take IB Calculus or Math 251&252 in high school ?

Take which ever one you want. You'll be taking more math in college.

Besides we don't know what's included in Math 251 and 252.

In any case, take the most challenging math you feel you can. The more you learn now, the less you will have to absorb in college, where there are more demands on your time. Plus, it will help develop good study habits now. That will be one of your greatest assets in college.

If you're considering a career as a pharmacist, it's important to have a strong foundation in mathematics. Both IB Calculus and Math 251&252 are advanced math courses that can help develop your skills in calculus, which is a fundamental aspect of pharmacy and pharmaceutical sciences.

IB Calculus is a course offered as part of the International Baccalaureate (IB) program, which is an internationally recognized curriculum. It typically covers topics such as limits, derivatives, and integrals. Taking IB Calculus can demonstrate to colleges or universities that you have a rigorous academic background and are prepared for higher-level math courses.

On the other hand, Math 251&252 refer to the standard calculus sequence offered at many high schools or colleges. Math 251 usually covers differential calculus and Math 252 covers integral calculus. These courses are often equivalent to the first two semesters of college-level calculus.

In terms of which course to choose, it depends on the availability of these courses at your high school and your personal preferences. If your school offers both IB Calculus and Math 251&252, you might want to consider factors such as the reputation of the courses, the qualifications of the teachers, and the level of challenge you're seeking. It may also be worth checking with the universities or colleges you're interested in attending to see if they have any specific math requirements or preferences for their pharmacy programs.

Ultimately, the priority should be to ensure that you have a solid understanding of calculus, as it will be essential for your studies as a pharmacist. If you have the opportunity to take either IB Calculus or Math 251&252 (or both), and you put in the effort to learn the material well, it can provide a strong mathematical foundation for your future pharmacy studies.