<p>I've been accepted as a pharmaceutical science major but I'm not sure if that's what I really want to do..</p>
<p>How difficult would it be to change my major from pharm sci to bio chem?</p>
<p>You can’t declare Biochem as your major until you are a junior. How difficult it is to do that depends on how well you do in the preparatory courses (the bio core, chem, ochem, ect). They take 24 people a year so I’ll assume it’s competitive. The requirements are detailed here:</p>
<p>[UCI</a> Change of Major Criteria: School of Biological Sciences](<a href=“http://www.changeofmajor.uci.edu/CoM_BioSci.html#biochem]UCI”>http://www.changeofmajor.uci.edu/CoM_BioSci.html#biochem)</p>
<p>I’m not sure how difficult it is to change from pharm-sci to biochem, but the good thing about pharm-sci is that if you study it undergrad and decide it’s not for you, because you took many of the same courses as biochem majors you can most likely go on to biochemistry graduate school afterwards. 
My dad was a biology and chemistry double major at UCI and really liked the programs, and I’m going into UCI this fall as a pharm-sci major, so I may be biased, but if you’re interested at all in pharmaceutical development (pharmacology) or becoming a pharmacist, it might be a good major to stick to. However, UCI has really good biology and amazing chemistry, so I completely understand why you would want to go into their biochem major. Best of luck! :)</p>