This WHO manual titled "Pharmacological Treatment of Mental Disorders in Primary Health Care" covers the essential medicines for mental health conditions. Within each disorder/chapter, the sections 6, 7, 8, and 9 cover adverse reactions, overdoses, special patient populations, and potentially relevant interactions, respectively. You should review: the treatment of psychosis (pp. 11 - 16);  the entire chapter 4 on depression (pp. 19 - 28); relevant medications for bipolar disorders (pp. 31 - 35); relevant medications for anxiety disorders (pp. 38 - 42); and adverse reactions, overdoses, special patient populations, and potentially relevant interactions for alcohol and opioids (p. 51 - 59). The rest of the manual is supplementary. Pay particular attention to the medications that are readily available in your setting.