This study is conducted to better understand Post-Traumatic Stress Symptoms (PTSS) in adolescent transplant recipients and their parent/guardian and to see if PTSS play a role in the way adolescent transplant recipients take their prescribed medicine.

Target population: medically stable adolescent solid organ (e.g., heart, kidney, liver, lung, small bowel) transplant recipients and their parent(s)/guardian.

Inclusion Criteria:

The patient:

• and/or their parent(s)/guardian must be able to understand and provide informed consent in English or Spanish;
• is prescribed tacrolimus (either brand or generic formulation); and
• has been seen in the enrolling center's clinic at least twice in the last two years.

Exclusion Criteria:

The patient:

• received a transplant less than 18 months prior to enrollment;
• has had more than one transplant (including marrow replacement);
• or their parent(s)/guardian is actively psychotic or severely disoriented due to any cause, including hepatic encephalopathy (temporary exclusion);
• or their parent(s)/guardian has been diagnosed with severe intellectual disability as defined in the Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5);
• is not medically stable or is hospitalized;
• is currently enrolled in a study that aims to improve adherence to medical recommendations;
• is receiving cognitive behavioral therapy for confirmed or suspected diagnosis of Post-Traumatic Stress Disorder (PTSD) at enrollment;
• is receiving psychotropic medications for a confirmed or suspected diagnosis of PTSD.

Adolescent transplant recipients at risk for non-adherence and can reliably answer self-report questionnaires.