Antidepressant Selection and Management

Introduction to Antidepressant Considerations

The American Academy of Family Physicians recommends considering adverse effect profiles, cost, and patient preferences when selecting second-generation antidepressants 1
Different antidepressants have varying side effect profiles, including diarrhea, dizziness, dry mouth, fatigue, headache, sexual dysfunction, sweating, tremor, and weight gain, which may be more relevant than lactose content for most patients 1
Nausea and vomiting are common reasons for discontinuation of antidepressant therapy 1

Selective serotonin reuptake inhibitors (SSRIs) like fluoxetine and sertraline are associated with weight loss during short-term use and weight neutrality with long-term use 2, 3
Certain antidepressants, such as paroxetine and amitriptyline, are associated with a greater risk for weight gain 2, 3
Bupropion is consistently shown to promote weight loss 2, 3
Lithium, mirtazapine, and monoamine oxidase inhibitors are closely associated with weight gain 2, 3

For older patients, preferred agents include citalopram, escitalopram, sertraline, mirtazapine, venlafaxine, and bupropion 1
Paroxetine and fluoxetine should generally be avoided in older adults due to higher rates of adverse effects 1

Regular weight monitoring is recommended during mirtazapine therapy due to its potential for weight gain, especially compared to other antidepressants, in patients with a low BMI, such as 16.5 4
In patients with very low BMI, medication side effects that promote weight gain require careful consideration against potential benefits, highlighting the need for cautious use of mirtazapine 5

For patients with depression and low BMI, antidepressants without significant weight gain effects, such as SSRIs or bupropion, should be prioritized initially, according to the American Medical Association, as reported in JAMA 6

If mirtazapine is used, close monitoring of weight and nutritional status is essential, as recommended by Implementation Science, to mitigate potential adverse effects 4
Regular follow-up to assess both depression symptoms and weight changes is crucial in patients with low BMI, such as 16.5, as noted in Clinical Gastroenterology and Hepatology 5