Alex has been experiencing severe feelings of despair and depression, and he has recently contemplated suicide. Which medication is most appropriate to help him in this situation?

Explanation

Among the options, Fluoxetine (a selective serotonin reuptake inhibitor) is the most effective medication for treating major depressive disorder and suicidal ideation. Alprazolam and Lorazepam are benzodiazepines used primarily for anxiety, not depression. Chlorpromazine is an antipsychotic, which is not first-line treatment for depression. Therefore, Fluoxetine is the best choice for Alex's condition.