We know you've tried other antidepressant drugs before… sometimes it's hard to know if you have the best answer right in front of you, but give Zoloft a chance. It affects serotonin in your brain differently than most medications for depression, and it may be just What is metronidazole 500 mg used for you need to feel better again. You can read more about how it works here, or try it out for What is metronidazole 500 mg used for yourself!