The nurse has working knowledge that each patient varies in their response and ability to tolerate a specific medication and dosage, so medications must be tailored to individual needs. Research indicates that the maximum benefit from SSRI treatment depends on adequate dosages and the duration of treatment. Ensuring treatment adherence is key to successful pharmacotherapy for Posttraumatic Stress Disorder (PTSD). Typically, it takes about four to six weeks to feel the full benefit. Medications are listed below for the treatment of PTSD: Select all that apply.