It would come down to the numbers I believe. How many physicians oppose it? 50? 500? 2/3rds? How often do the side effects (which is, no matter how devastating they seem to us, what they are) come into play? Where is the correlation between the use of the product and an increase in the desired behavior the product is marketed for? Is it always there? Barely there?
In the meantime, I certainly wouldn't encourage the use of such a product.