PTCB Guide to Antipsychotics

Also called neuroleptics, typical and atypical · suffix -apine, -idone, -azine · updated August 6, 2026

What gets tested

• Matching brand to generic: Haldol is haloperidol, Risperdal is risperidone, Seroquel is quetiapine, Zyprexa is olanzapine, Abilify is aripiprazole, Clozaril is clozapine
• The typical versus atypical split and what each trades off
• Extrapyramidal symptoms, tardive dyskinesia, and neuroleptic malignant syndrome as the movement and emergency effects
• Metabolic monitoring with the atypical agents
• Clozapine's absolute neutrophil count monitoring and its restricted distribution program
• The boxed warning about elderly patients with dementia

What is not tested

You are not asked to select an antipsychotic, to know receptor binding profiles in detail, or to manage a psychiatric condition. Focus on brand and generic pairs, the typical versus atypical distinction, the major adverse effect categories, and the monitoring requirements. Strengths, dosage forms, routes, special handling, and duration of therapy sit inside PTCE knowledge area 1.4, and the long-acting injectable forms in this class make route and form accuracy important.

Why antipsychotics matter

Quetiapine and aripiprazole are widely dispensed, and antipsychotics generate an unusual amount of pharmacy workflow: metabolic monitoring, long-acting injections, and in clozapine's case a restricted distribution program that will not release the drug without a current lab result. That last point is a concrete example of a REMS program, which the exam expects technicians to understand.

Antipsychotics at a glance

Mechanism of action

Psychotic symptoms such as hallucinations and delusions are linked to excess dopamine signalling in one particular brain pathway, the mesolimbic pathway. Every antipsychotic blocks dopamine D2 receptors, which is what reduces those symptoms. The difficulty is that dopamine does several other jobs elsewhere in the brain, and the drug cannot tell the pathways apart. Blocking D2 in the nigrostriatal pathway, which coordinates movement, produces the extrapyramidal symptoms: dystonia (sustained muscle contractions), akathisia (an intense restlessness), drug-induced parkinsonism, and, after prolonged exposure, tardive dyskinesia, a repetitive involuntary movement disorder of the face and tongue that may not reverse when the drug is withdrawn. Blocking D2 in the tuberoinfundibular pathway lifts prolactin, which can cause breast enlargement, milk production, and sexual dysfunction, an effect especially associated with risperidone. The first generation, or typical, antipsychotics such as haloperidol block D2 strongly and produce these movement effects readily. The second generation, or atypical, agents add potent blockade of serotonin 5-HT2A receptors. Because serotonin normally restrains dopamine release in the movement pathway, blocking 5-HT2A lets a little dopamine through there, which substantially reduces extrapyramidal symptoms. The trade is metabolic: many atypicals also block histamine H1 and other receptors, driving appetite, weight gain, insulin resistance, and raised lipids, with olanzapine and quetiapine the worst offenders. Aripiprazole works differently again, acting as a partial agonist that stabilizes rather than fully blocks dopamine signalling. Clozapine is the most effective agent for treatment-resistant illness but can suppress neutrophil production, which is why it is dispensed only against a current absolute neutrophil count.

Common and important side effects

• Extrapyramidal symptoms: dystonia, akathisia, and drug-induced parkinsonism, most common with typical agents
• Tardive dyskinesia, involuntary repetitive movements of the face and tongue, which can be permanent
• Neuroleptic malignant syndrome: high fever, muscle rigidity, confusion, and unstable vital signs. This is a medical emergency
• Metabolic effects with atypical agents: weight gain, raised blood glucose and new diabetes, and raised lipids
• Sedation and dizziness, prominent with quetiapine and olanzapine
• Orthostatic hypotension
• Raised prolactin, causing breast enlargement, milk production, and sexual dysfunction, notably with risperidone
• QT prolongation, most associated with ziprasidone
• Severe neutropenia with clozapine, plus seizures, myocarditis, and heavy salivation

Key interactions

• Other QT-prolonging drugs raise arrhythmia risk, which matters most with ziprasidone and haloperidol
• Alcohol, opioids, benzodiazepines, and other sedatives add to central nervous system depression
• Carbamazepine induces metabolism and lowers levels of several antipsychotics, and must not be combined with clozapine because both suppress bone marrow
• Strong CYP inhibitors such as fluoxetine and paroxetine raise levels of several agents
• Smoking induces CYP1A2 and lowers clozapine and olanzapine levels, so stopping smoking can raise them sharply
• Anticholinergic drugs add to dry mouth, constipation, and confusion

Patient counseling notes

• Report any new involuntary movements, especially of the face, mouth, or tongue, without delay
• Report high fever with muscle stiffness and confusion as an emergency, because it can signal neuroleptic malignant syndrome
• Expect regular weight, blood glucose, and lipid checks on atypical agents
• Rise slowly from sitting or lying, because these drugs can drop blood pressure on standing
• Do not stop the medicine suddenly, and speak to the prescriber before any change
• Clozapine patients must have their blood count drawn on schedule, because the pharmacy cannot release the prescription without a current result
• Tell the pharmacist if you start or stop smoking, because it changes the level of some of these drugs

Practice questions

Work the Antipsychotics questions below first, then widen out. Two skills carry most of the Medications domain, and each has its own quiz. The first is drug class identification: recognising which class a drug belongs to from its name or its stem, which is what the drug class identification quiz drills across every class. The second is brand and generic recall, because the exam switches between the two names freely and expects you to follow. Pair this guide with the brand and generic quiz until the brand and generic pairs in the table above come back without effort.

Related drug-class guides

Official sources

• MedlinePlus: Haloperidol
• MedlinePlus: Risperidone
• MedlinePlus: Quetiapine
• MedlinePlus: Aripiprazole
• MedlinePlus: Clozapine
• ClinCalc DrugStats: Quetiapine (dispensing data)

PTCB Quiz Prep is an independent study resource, not affiliated with the Pharmacy Technician Certification Board. This guide is for exam preparation, not medical advice. Part of the PTCB Medications domain.