Antidepressant Medications and Nursing Considerations

Adverse Effects and Nursing Considerations

In addition to the side effects shared with SSRIs, SNRIs can cause hypertension, tachycardia, and liver injury.

Nurses should:

• Monitor Vital Signs: Closely track blood pressure and heart rate.
• Discontinuation Syndrome: Watch for symptoms if a dose is missed, such as dizziness, nausea, irritability, anxiety, or "electric shock" sensations.
• Mental Status: Assess for worsening depression, suicidal thoughts, or manic symptoms.

Tricyclic Antidepressants (TCAs)

TCAs are an older class of antidepressants that are highly effective but require careful monitoring due to their side effect profile.

Mechanism and Indications

TCAs inhibit the reuptake of both serotonin and norepinephrine. They are indicated for depression, neuropathic pain, migraine prevention, and OCD (specifically Clomipramine). Examples include Amitriptyline, Clomipramine, Imipramine, and Nortriptyline.

Adverse Effects and Nursing Considerations

TCAs are known for significant anticholinergic effects and cardiovascular risks. Adverse effects include orthostatic hypotension, cardiac dysrhythmias, weight gain, confusion, constipation, dry mouth, sexual dysfunction, and seizures.

Nursing Priorities:

• Cardiac Safety: Assess cardiac history and obtain an ECG when indicated.
• Safety: Monitor for orthostatic changes and implement fall precautions.
• Emergency Preparedness: A suspected overdose with TCAs is considered a medical emergency.

Patient Teaching Tip: Instruct patients to change positions slowly to prevent fainting from orthostatic hypotension and to avoid alcohol.

Monoamine Oxidase Inhibitors (MAOIs)

MAOIs are typically reserved for selected cases of depression where other treatments have failed.

Mechanism and Indications

MAOIs inhibit monoamine oxidase, the enzyme responsible for breaking down neurotransmitters like serotonin, norepinephrine, and dopamine. Common medications include Phenelzine, Tranylcypromine, and Isocarboxazid.

The Danger of Hypertensive Crisis

The most critical risk with MAOIs is a hypertensive crisis caused by interactions with tyramine-rich foods.

Nursing Considerations

• Dietary Education: Ensure the patient understands the low-tyramine diet.
• Medication Review: Review all medications; many OTC cough/decongestant meds interact dangerously.
• Washout Period: A washout period of at least 14 days is required when switching between an MAOI and another antidepressant.
• Symptom Reporting: Patients must report severe headaches, chest pain, or palpitations immediately, as these may indicate a hypertensive crisis.

Summary of Other Anxiolytics

While not primary antidepressants, these medications are often used in conjunction with or alongside antidepressant therapy to manage anxiety symptoms.

Benzodiazepines

• Mechanism: Enhance the effect of GABA (an inhibitory neurotransmitter).
• Indications: Short-term treatment of acute anxiety, panic, agitation, seizures, and alcohol withdrawal.
• Risks: CNS depression, respiratory depression, dependence, and falls.
• Nursing: Monitor respiratory rate and LOC; implement fall precautions.

Atypical Anxiolytics (Buspirone)

• Mechanism: Acts as a partial agonist at serotonin 5-HT1A receptors.
• Indications: Generalized anxiety disorder.
• Nursing: Monitor for dizziness and fall risk; note that it takes several weeks for full effect.
• Teaching: Avoid grapefruit juice.