In cases of posttraumatic stress disorder, eye movement desensitization reprocessing (EMDR) is also considered a valid first-choice treatment option. The first two or three treatment steps in pharmacotherapy consist of prescribing antidepressant medication. The guideline favors selective serotonin reuptake Inhibitors (SSRIs) over tricyclic antidepressants (TCAs). In most cases, if an SSRI produces an insufficient result, switching to a second SSRI is recommended before prescribing a TCA. In cases of social anxiety disorder the third pharmacological treatment step is the prescription of a benzodiazepine or monoamine oxidase inhibitor (MAOI). In cases of obsessive - compulsive disorder that are resistant to treatment, the third step consists of augmentation of SSRI therapy with an atypical antipsychotic.