It's easier to say "talk to your doctor about X" than get attractive pharmaceutical sales reps to convince doctors about the same drug's efficacy with a pamphlet.

In the US there is advertisement for drugs. You have symptoms XYZ? You might have disease A. We can help. Talk to your doctor for medication B.

In many countries, this is forbidden.

In some sense, they are a company like any other, why restrict their ability to advertise?

Then again, its not exactly good intentions that got us here.