Nursing Guide to Antipsychotics and Antidepressants
A Complete Medication Algorithm for Students
Understanding antipsychotics and antidepressants is essential for nursing students preparing for clinical practice, exams, and safe patient care. These two major medication categories are widely used in mental health management, yet they come with significant considerations related to side effects, monitoring, and patient education. Save this nursing guide to Antipsychotics and Antidepressants
Table of Contents
- Introduction to Antipsychotics and Antidepressants
- What Are Antipsychotics?
2.1 First-Generation (Typical) Antipsychotics
2.2 Second-Generation (Atypical) Antipsychotics
2.3 General Considerations for All Antipsychotics - Understanding Antidepressants and Anxiolytics
3.1 Selective Serotonin Reuptake Inhibitors (SSRIs)
3.2 Serotonin–Norepinephrine Reuptake Inhibitors (SNRIs)
3.3 Monoamine Oxidase Inhibitors (MAOIs)
3.4 Tricyclic Antidepressants (TCAs)
3.5 NMDA Antagonists
3.6 Atypical Antidepressants - Benzodiazepines
- Barbiturates
- Critical Considerations for All Antidepressants
- Final Thoughts
What Are Antipsychotics?
Antipsychotics are medications used to treat psychiatric conditions involving psychosis—such as hallucinations, delusions, paranoia, or disorganized thought. They are divided into two major categories:
1. First-Generation (Typical) Antipsychotics
These agents primarily block dopamine and were the earliest antipsychotics used clinically.
Common Medications
- Haloperidol
- Chlorpromazine
- Prochlorperazine
- Acetophenazine
Key Side Effects
- Extrapyramidal Symptoms (EPS): Akathisia, rigidity, bradykinesia, tremor, dystonia
- Tardive Dyskinesia: Lip smacking, facial grimacing, tongue writhing
- Neuroleptic Malignant Syndrome (NMS): Fever, rigidity, mental status changes, autonomic instability
- Hematologic effects: Agranulocytosis, neutropenia, leukopenia
- Seizure threshold reduction
- QTc prolongation
These effects are more common due to their strong dopamine-blocking action. EPS and tardive dyskinesia can be permanent even after stopping the drug, making early recognition a critical nursing responsibility.
2. Second-Generation (Atypical) Antipsychotics
Atypical antipsychotics primarily affect serotonin receptors and are preferred for long-term therapy due to a more favorable side-effect profile.
Common Medications
- Olanzapine
- Risperidone
- Quetiapine
- Aripiprazole
- Clozapine
Key Side Effects
- Metabolic syndrome: Weight gain, dyslipidemia, hyperglycemia
- Nurses should monitor: Lipid panel, fasting glucose, BP, height/weight, waist circumference
- Serotonin syndrome risk
- Increased stroke risk in older adults with dementia (FDA boxed warning)
Metabolism Note:
Most antipsychotics undergo first-pass metabolism, but olanzapine, risperidone, and aripiprazole do not, making them preferable in hepatic impairment.
General Considerations for All Antipsychotics
- Avoid in pregnancy, especially first trimester
- Secreted into breast milk
- Some first-generation agents require therapeutic drug monitoring
- Monitor QTc intervals
- Educate patients on early reporting of EPS or NMS symptoms
Understanding Antidepressants and Anxiolytics
These medications are used to manage depression, anxiety disorders, and mood instability. Several classes exist, each with distinct mechanisms and adverse effects.
1. Selective Serotonin Reuptake Inhibitors (SSRIs)
SSRIs block serotonin reuptake, increasing its availability in the synaptic cleft.
Common SSRIs
- Sertraline
- Citalopram
- Escitalopram
- Fluoxetine
- Paroxetine
Primary Uses
- First-line for depression
- First-line for long-term anxiety management
Adverse Effects
- Weight gain
- Sexual dysfunction
- QTc prolongation
2. Serotonin–Norepinephrine Reuptake Inhibitors (SNRIs)
These medications increase both norepinephrine and serotonin.
Common SNRIs
- Venlafaxine
- Desvenlafaxine
- Duloxetine
- Milnacipran
Adverse Effects
- Hypertension
- Diaphoresis
- Bone resorption
- Headache
3. Monoamine Oxidase Inhibitors (MAOIs)
These inhibit the enzyme responsible for breaking down serotonin, norepinephrine, and dopamine.
Common MAOIs
- Selegiline
- Moclobemide
- Phenelzine
Key Notes
- Rarely used due to extensive food and drug interactions
- High risk of serotonin syndrome
- Can cause sexual dysfunction
4. Tricyclic Antidepressants (TCAs)
TCAs block serotonin and norepinephrine reuptake and have additional anticholinergic effects.
Common TCAs
- Amitriptyline
- Doxepin
- Imipramine
- Nortriptyline
Adverse Effects
- Dry mouth, constipation, urinary retention
- QRS prolongation
- Orthostatic hypotension
- Seizure risk
Contraindications
- Underlying cardiovascular disease
- Bundle branch blocks
5. NMDA Antagonists
These are newer agents used for treatment-resistant depression.
Common Drugs
- Esketamine
- Dextromethorphan
Adverse Effects
- Esketamine: Dissociation, high abuse potential
- Dextromethorphan: Dizziness, headache, dry mouth
6. Atypical Antidepressants
These have unique mechanisms and varied clinical uses.
Bupropion
- Inhibits dopamine & norepinephrine reuptake
- Avoid in patients with seizure disorders
- Also used for smoking cessation
- Side effects: Dry mouth, dizziness, headache
Mirtazapine
- Increases norepinephrine and dopamine via alpha-2 blockade
- Side effects: Sedation, weight gain
Benzodiazepines
Benzodiazepines are commonly used for acute anxiety management and work by enhancing GABA activity.
Common Medications
- Alprazolam
- Clonazepam
- Lorazepam
- Midazolam
- Diazepam
- Oxazepam
- Chlordiazepoxide
Adverse Effects
- Respiratory depression
- Sedation
- Confusion
- Nausea and vomiting
- Hallucinations
Key Nursing Considerations
- Stored in fat → accumulation with continuous use
- High mortality risk when combined with opioids
- Abrupt discontinuation after long-term use can cause seizures
Barbiturates
Used less frequently due to narrow therapeutic index and high abuse potential.
Common Uses
- Seizure disorders
- Acute alcohol withdrawal
- Increased intracranial pressure
Common Medications
- Phenobarbital
- Pentobarbital
Adverse Effects
- Sedation
- Bradycardia
- Hypotension
- Respiratory depression
Serious Risks
- DRESS syndrome
- Stevens-Johnson syndrome
- Toxic epidermal necrolysis
Critical Considerations for All Antidepressants
Every antidepressant carries an FDA boxed warning for increased suicidal thoughts during the first weeks of therapy.
Nurses must:
- Educate patients and their support systems
- Monitor mood and behavior changes
- Reinforce that therapeutic effects take several weeks
- Discuss common side effects: Weight gain, drowsiness, insomnia, dry mouth, nausea
Rare reactions include SIADH, hyponatremia, and hyperprolactinemia.
Final Thoughts
Antipsychotics and antidepressants play a vital role in psychiatric care, but they require careful nursing assessment, patient education, and monitoring. Understanding the differences between medication classes—and their unique risks—equips nursing students to provide safe, evidence-informed care. Remember to save this nursing guide to Antipsychotics and Antidepressants