it depends on what you got the first time. For some schools, anything lower than a C for pre-reqs will hurt you even if you retake it and get an A the second time around. Are the 5 classes you're retaking considered pharmacy pre-reqs? or are they just to boost your overall GPA? In addition, if you were to first receive a grade higher than a C and retake it to get an A, then you should be fine. However, a word of advice, if you have to keep retaking classes to get an A, maybe you should lessen your school load and focus on the pre-reqs because they're the most important. Its not smart to waste $ like that if you have to retake a bunch of classes.