How much tricyclic antidepressant would be considered too little?

Varies: Many of the tricyclic antidepressants have established blood levels that are associated with the best outcome. Rather than rely on a specific oral dose, i would have your physician order blood tests to determine the amount of the medication in your system and then adjust the oral dose according.

TCAs: This depends on what they are used for. For depression, therapeutic doses are higher than if used for headaches or pain or bedwetting.