The antidepressant fluoxetine is a typical representative of selective 5-hydroxytryptamine reuptake inhibitors, that is, antidepressants of the SSRI class, and it is the first 5-hydroxytryptamine reuptake inhibitor to be marketed and used in antidepressants, with very good effects and more clinical use and experience, so currently this drug belongs to the first line of antidepressant use. It is not only antidepressant, but also can treat obsessive-compulsive disorder, so for depressed patients with obsessive-compulsive thinking, which is specifically manifested by repeatedly thinking about unhappy things, that is, depressed patients with rumination phenomenon, the effect of using fluoxetine is very good, or people with mixed depression and obsessive-compulsive problems, such as depression that already has problems such as repeated hand washing and repeated examination, and also has obsessive-compulsive problems Fluoxetine can be used for treatment. Fluoxetine is also very effective in treating eating disorders, for example, some depressed patients who have decreased appetite or have problems with overeating can also be treated with fluoxetine.