A woman in the grip of pre-menstrual dysphoric disease slams grocery carts outside a supermarket in frustration. A concerned young Japanese woman asks her husband if he has ever been happy. Peppy actors in lab coats reassure the audience that depression is like "a cold of the soul."

These are scenes from some of the many pharmaceutical ads that pepper BRANDING ILLNESS, an eye-opening documentary about how big drug companies create diseases and then supply the medications that can cure them.

It's a reversal of the traditional approach—trying to discover a drug that cures an illness—and one that relies far more heavily on marketing than on research.

The film offers case after startling case of how big pharma creates the conversation around new diseases and then offers up the solutions. Take pre-menstrual dysphoric disease. It appeared right about the time the patent on Prozac was about to expire, representing a significant loss of income. Enter PMDD. Prozac manufacturer Eli Lilly rebranded the drug, changed its colour, jacked up the price, and had a potentially profitable new medication to sell as a treatment for a disease few had ever heard of before.

Featuring at times acerbic commentary from experts including physicians, historians and medical anthropologists (among them maverick academic David Healy), BRANDING ILLNESS offers unprecedented insight into the ways illnesses and their potential cures are marketed. No claim seems too outrageous—whether it's convincing the Japanese they have widespread depression, urging millions of healthy adults they need medication to lower their cholesterol, or even proposing that all adults over 50 take a "poly-pill" to lower their risk of common diseases.

And if it's hard for consumers to get access to objective opinions, it's no easier for independent-minded academics. Medical anthropologist Kalman Applbaum says 80% of clinical trials and 97% of the most influential clinical trials are commercially funded.

Even science has become a tool to advance the sales of drugs.