My friend is 24 years old, he has severe depression for more than 1 year without treatment but before month he went to the doctor and he gave him three medications (zotral 100 mg, tryptizol 25 and olanzapine 5 mg) in the beginning he felt it is good but now after 3 weeks the symptoms of depression started to appear again. What is that? And how to solve this problem? Also after using the tablets his sexual desire became low and this is affecting him very much. Thank you in advance.