why do they advertise drugs that so many side effects?

[bcnu]

As a general rule, approved drugs have been tested to show efficacy for a specific purpose, i.e., it mostly works. However, the testing also shows side-effects, which might only occur in a tiny fraction of the subjects using the drug for its advantages. Because there is a KNOWN risk, the company has an obligation to disclose it to potential users who might otherwise unknowingly poison themselves.