When do you decide to use liothyronine (T3) for augmentation in treatment for treatment-resistant depression and how do you implement it?

The starting dose is between 5 and 25 mcg daily, and it escalates every 2-3 weeks but only after lab f/u results. Baseline FT4, T3,TSH and f/u labs. Avoid suppressing TSH excessively, to prevent osteoporosis.