The first-line treatment for anorexia nervosa is psychotherapy. Medication management is to be adjunct to psychotherapy. There is no recommendation by the FDA specifically with regard to medications to treat anorexia nervosa.
SSRIs and TCAs have been shown to be effective in reducing the frequency of binge eating and purging disorders, not anorexia nervosa.

SSRI medications can take up to 8 weeks for full therapeutic effects to be realized. Difficulty sleeping and dry mouth are common initial side effects and dissipate as therapy progresses.
From the information reported, there is no reason to stop the medication, and decreasing it will reduce the efficacy for target symptoms. Because the medication takes 8 weeks to reach its full effect, it would be premature to increase it after 2 weeks.

Biological therapy, also known as biomedicine or somatic therapy, encompasses treatments that address the biological underpinnings of mental disorders. This type of therapy is primarily concerned with the brain's chemistry and structure, and the nervous system's overall function. It aims to relieve psychological distress through the modification of the body's biological systems.
ECT (Electroconvulsive Therapy) and psychopharmacology are two prominent examples of biological therapy. Psychopharmacology involves the use of medications to manage symptoms of mental disorders. These medications, which include antidepressants, antipsychotics, and mood stabilizers, work by altering the levels of neurotransmitters in the brain, thereby influencing mood and behavior.
ECT, on the other hand, is a procedure in which electric currents are passed through the brain, intentionally triggering a brief seizure. ECT seems to cause changes in brain chemistry that can quickly reverse symptoms of certain mental health conditions. Despite its somewhat controversial nature, it is often used when other treatments have failed, particularly in severe cases of depression.
Both ECT and psychopharmacology are grounded in the scientific understanding of neurological and biochemical mechanisms. They represent direct interventions aimed at the physical aspects of mental disorders, distinguishing them from psychological therapies that focus on thought and behavior patterns. This focus on biological processes validates their categorization under biological therapies.
It is important to highlight that the choice between biological therapy and other forms of treatment like cognitive or behavior therapy depends on the specific needs and conditions of the patient, as well as the nature of the disorder being treated. Often, a combination of biological and psychological therapies can provide the most effective approach to managing mental health issues.

There are three phases of therapy, which are the orientation, working, and termination phases. The purpose of the orientation phase is to establish trust and identify goals with the client. The PMHNP establishes boundaries, sets expectations for treatment, and outlines a timeline for the completion of goals.

Antidepressants are considered the first-line pharmacotherapy for bulimia nervosa. Selective serotonin reuptake inhibitors (SSRIs), such as fluoxetine and sertraline, are commonly used to treat bulimia nervosa. These drugs increase serotonin levels, a neurotransmitter that regulates mood, appetite, and impulse control. By increasing serotonin levels, SSRIs can help reduce binge eating and purging behavior in individuals with bulimia nervosa.
Antipsychotics, anticonvulsants, and stimulants are not first-line treatment for bulimia nervosa and are used only in specific cases.