Antipsychotics: Typical vs Atypical — Nursing Study Guide

Antipsychotics are high-yield on NCLEX and nursing exams because they treat schizophrenia and other psychotic disorders but carry serious neurologic, metabolic, and hematologic risks. This guide compares typical (first-generation) and atypical (second-generation) antipsychotics, with the side effects, monitoring, and nursing actions you must know.

Antipsychotic Classes

• Typical (first-generation): Haloperidol, Chlorpromazine, Fluphenazine
  • Treat positive symptoms only (hallucinations, delusions)
  • High EPS risk
• Atypical (second-generation): Risperidone, Olanzapine, Quetiapine, Clozapine, Aripiprazole
  • Treat positive AND negative symptoms
  • Lower EPS risk, but high metabolic syndrome risk

Mechanism of Action

• Typical antipsychotics primarily block dopamine D2 receptors, reducing positive symptoms such as hallucinations and delusions.
• Atypical antipsychotics block both D2 and serotonin 5-HT2A receptors. Serotonin blockade lowers EPS risk and improves negative symptoms like apathy and social withdrawal.

Typical Antipsychotics (First-Generation)

• Used for positive symptoms of schizophrenia (hallucinations, delusions).
• Haloperidol is commonly used for acute agitation and psychosis.

Extrapyramidal Symptoms (EPS)

• Acute dystonia: muscle spasms, neck stiffness, tongue protrusion, laryngospasm (can obstruct airway).
• Akathisia: severe restlessness, pacing, inability to sit still, intense anxiety.
• Parkinsonism: tremor, rigidity, bradykinesia, shuffling gait.
• Tardive dyskinesia: involuntary lip smacking, tongue thrusting, eye blinking, facial grimacing — may be irreversible.

Nursing Actions for EPS

• Acute dystonia: give anticholinergic drugs such as benztropine or diphenhydramine immediately.
• Akathisia: beta-blockers or benzodiazepines as ordered.
• Parkinsonism: dose reduction or anticholinergic medications.
• Tardive dyskinesia: monitor with the AIMS scale and report early signs.

Neuroleptic Malignant Syndrome (NMS)

A life-threatening emergency. Signs:

• High fever
• Severe muscle rigidity
• Altered mental status
• Tachycardia, hypertension, diaphoresis

Nursing actions: stop the antipsychotic immediately, notify provider, initiate cooling measures, give IV fluids, and provide supportive care (often ICU).

Other Side Effects

• Anticholinergic effects: dry mouth, blurred vision, constipation, urinary retention.
• Orthostatic hypotension, especially with low-potency agents like chlorpromazine.
• Sedation and photosensitivity (teach sun protection).

Atypical Antipsychotics (Second-Generation)

• Treat both positive and negative symptoms of schizophrenia.
• Also used for bipolar disorder, adjunct in depression, and irritability in autism.

Metabolic Syndrome

• Weight gain, especially with olanzapine and clozapine.
• Hyperglycemia and new-onset diabetes — monitor blood glucose.
• Hyperlipidemia — monitor cholesterol and triglycerides.
• Nursing actions: monitor weight, BMI, blood glucose, and lipid profiles at baseline and regularly.

EPS Risk

• Lower than typical antipsychotics due to serotonin blockade.
• Risperidone has higher EPS risk at high doses.
• Clozapine and quetiapine have the lowest EPS risk.

Clozapine Specifics

• Black box warning for agranulocytosis — monitor absolute neutrophil count (ANC) before each dose.
• Patients must be enrolled in a REMS program with weekly or monthly blood draws.
• Teach patients to report fever, sore throat, or signs of infection immediately.
• Additional risks: myocarditis, seizures, orthostatic hypotension.

Other Side Effects

• Sedation, especially with quetiapine and clozapine.
• Anticholinergic effects are milder than with typical antipsychotics.
• Orthostatic hypotension — teach slow position changes.

Contraindications

• Typical antipsychotics: severe CNS depression, Parkinson's disease (worsens symptoms), narrow-angle glaucoma.
• Atypical antipsychotics: caution in elderly with dementia-related psychosis (increased mortality).
• Clozapine: uncontrolled epilepsy, myeloproliferative disorders, severe neutropenia, paralytic ileus.

Black Box Warnings

• All antipsychotics: increased mortality in elderly patients with dementia-related psychosis.
• Clozapine: agranulocytosis, seizures, myocarditis, orthostatic hypotension.
• Olanzapine: metabolic changes including hyperglycemia and weight gain.

Common Exam Traps

• Confusing EPS with NMS — EPS has normal vital signs; NMS has fever and autonomic changes.
• Missing early signs of tardive dyskinesia or forgetting to monitor for metabolic syndrome with atypicals.
• Giving clozapine without checking ANC or missing infection signs (fever, sore throat).
• Using antipsychotics in elderly dementia patients without recalling the black box warning.
• Expecting antipsychotics to work immediately or stopping them abruptly.

Key Takeaways

• Typical antipsychotics block D2, treat positive symptoms, and cause high EPS risk.
• Atypical antipsychotics block D2 + 5-HT2A, treat positive and negative symptoms, but cause metabolic syndrome.
• NMS = fever, rigidity, autonomic instability — stop the drug and treat as an ICU emergency.
• Clozapine requires ANC monitoring before every dose and immediate reporting of infection signs.
• All antipsychotics carry a black box warning for increased mortality in elderly dementia patients.
• For acute dystonia, give benztropine or diphenhydramine immediately.