An antidepressant, such as Prozac (fluoxetine) or Zoloft (sertraline), can be an effective strategy to alleviate depression symptoms, but it is not appropriate for everyone. Aside from potential negative effects, several antidepressants might cause your period to be late or delayed. These include bupropion, fluvoxamine, imipramine, lithium, paroxetine, and trazodone. If you're taking one of these medications, be sure to tell your doctor if you plan to become pregnant or if you already are. He or she will be able to help you decide whether there's a need to continue the pregnancy while you're taking them and, if so, what changes should be made in your treatment plan.