It's quite common in marketing, doctors are professionals...

It's quite common in marketing, doctors are professionals who are used to rather dull work. It's a nice way to lighten the mood and catch their attention. The presentations themselves are very professional, these are simply fun posters/images to attract the attention of doctors. After that, once they have the customers' attention, they definitely use a more informational and evidence based approach to promoting the product. Many of these promotional presentations are available on YouTube to be watched, they definitely don't carry the same tone as the posters/images used to catch the attention of doctors.

It's worked so far, they're vastly beating all other competitors in terms of growth in the US. But the "magic bus" is only used as the catch, the main part of the marketing occurs once they have the doctors' attention.