Swallow (2001)

A single mother is prescribed a controversial anti-depressant called Distral and quickly becomes dependant, but discovers that giving up the drug causes terrible side-effects. Unable to find support for her plight, she mounts a personal crusade against the pharmaceutical company who produce the pills. Meanwhile, a cynical marketing executive for the company has been trying to suppress all bad publicity and promote Distral as a wonder-product, but as he watches his sister suffer from terminal cancer, he begins to question his own ethics.