The general categories of herbs and their functions are:
Herbal medications and supplements may interact in harmful ways with over-the-counter or prescription medicines you are taking.
Taking herbal supplements may decrease the effectiveness of other drugs you are taking or may increase the negative side effects.
It is very important that people do not self-diagnose any health conditions. Any medication (herbal or otherwise) should be taken under the supervision of a knowledgeable and qualified practitioner.