This week, six pharmaceutical stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

This week, Intra-Cellular Therapies, Inc. (ITCI) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). In Portfolio Grader’s specific subcategories of Earnings Momentum and Earnings Revisions, ITCI also gets A’s. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of ITCI stock.

NuPathe Inc. (PATH) boosts its rating from a C to a B this week. NuPathe develops pharmaceutical products used for the treatment and management of neurological and psychiatric diseases. For more information, get Portfolio Grader’s complete analysis of PATH stock.

This week, Mallinckrodt Plc (MNK) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. For more information, get Portfolio Grader’s complete analysis of MNK stock.

This week, Prestige Brands Holdings, Inc.’s (PBH) ratings are up from a C last week to a B. Prestige Brands distributes over-the-counter healthcare and household cleaning products to retail stores in the United States, Canada and other international markets. For more information, get Portfolio Grader’s complete analysis of PBH stock.

Watson Pharmaceuticals’ (WPI) ratings are looking better this week, moving up to an A from last week’s B. Watson develops, manufactures, markets, sells and distributes pharmaceutical products. For more information, get Portfolio Grader’s complete analysis of WPI stock.

This is a strong week for Corcept Therapeutics Incorporated. (CORT). The company’s rating climbs to B from the previous week’s C. Corcept Therapeutics engages in the discovery, development, and commercialization of drugs for the treatment of severe metabolic and psychiatric disorders. For more information, get Portfolio Grader’s complete analysis of CORT stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.