Examples of therapeutic side effects

Most drugs and procedures have a multitude of reported adverse side effects; the information leaflets provided with virtually all drugs list possible side effects. Beneficial side effects are less common; some examples, in many cases of side-effects that ultimately gained regulatory approval as intended effects, are:
* Bevacizumab (Avastin), used to slow the growth of blood vessels, has been used against dry age-related macular degeneration,