Research has shown that psychotherapy results in fewer relapses of common conditions such as moderate depression and anxiety, and that the positive effects of good therapy extend well beyond treatment. In fact, many clients report improved conditions long after therapy has ended. In general, psychotherapy is often more effective than psychotropic drugs or medical treatments alone, which may cause harmful side effects. In addition, many therapeutic modalities are evidence-based, meaning they have been subject to research studies and clinical observations, and they have been analyzed for effectiveness.