There are lots of different movies swimming around inside the latest cinematic offering from director Edward Zwick (Glory, thirtysomething). Love and Other Drugs is part disease drama, part commentary on the greed of Big Pharma, part Apatowian dick-joke comedy and part sex-charged romance. This last element is the only one that really works, but it’s enough. Jamie (Jake Gyllenhaal), a womanizing Pfizer drug rep, and Maggie (Anne Hathaway), an artist with early-onset Parkinson’s, attempt a no-strings attached sexual relationship but develop an emotional attachment against their will. Gyllenhaal and Hathaway are completely believable as a couple that can’t stop jumping each other’s bones, and their chemistry---and frequent nudity---is a gravitational force that barely overcomes the tangents that threaten to carry the film out of orbit.