Background: The anesthetic Ketamine has been shown to exert rapid effects in a variety of mental disorders, especially in depression. Recent studies have demonstrated that Ketamine can improve neuroplasticity, the brain’s ability to adapt and form new neuronal connections (Aleksandrova & Phillips, 2021). Aim: To examine the long-term effects of Ketamine without and in combination with other treatments. Method: 26 patients, some of them who only received ketamine and some of them who received additionally rTMS, Neurofeedback and Psychotherapy, were asked to estimate (partially retrospectively) how their mood was expressed pre-treatment, post-treatment and at the time of the survey. The results were analyzed by using descriptive statistics. Results: 25 patients showed a long-term improved effect in their mood after the treatment, even though the treatment was carried out a long time ago. Patients who received a combination of treatments showed a better mood, than the patients who solely got ketamine infusions. Conclusions: Patients who received ketamine therapy exhibited promising lasting effects. Their mood changed considerably, regardless of whether they only got ketamine infusions or a combination treatment, but combining ketamine with other treatments seems to have a superior effect.