From the National Association of Boards of Pharmacy's site:
The North American Pharmacist Licensure Examination® (NAPLEX®) is designed to evaluate general practice knowledge and is taken by recent college of pharmacy graduates shortly after they receive their degree. The exam is also taken by foreign-educated pharmacists who have earned FPGEC Certification. The NAPLEX is just one component of the licensure process and is used by the boards of pharmacy to assess a candidate’s competence to practice as a pharmacist.
The NAPLEX is a 6 hour exam composed of 225 questions that are delivered in a computerized, fixed form. The exam results will be reported as pass or fail, and candidates are allowed 5 attempts to pass the exam.