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Revised Summary of Antipsychotics for Dental Practice
This summary outlines the key aspects of antipsychotic medications, explicitly linking their side effects to the drugs that cause them and detailing specific considerations for dental management, based on the provided lecture notes.
Indications and Mechanism
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Indications: Antipsychotic drugs are used for acute and chronic psychosis and bipolar disorder to relieve symptoms like hallucinations and delusions.
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Mechanism of Action: The mechanism for the antipsychotic class is believed to be the blockade of dopaminergic transmission in the brain.
Adverse Drug Reactions (ADRs) Caused by Antipsychotics
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General Side Effects: Antipsychotics as a class can cause sedation, anxiety, agitation, orthostatic hypotension, and dry mouth.
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Extrapyramidal Side Effects (EPSE): A significant concern with the antipsychotic class is the risk of EPSE, which includes dystonia (abnormal facial muscle tone), akathisia (restlessness), and parkinsonism (e.g., tremor). For example, the document notes that haloperidol can cause tremors as an EPSE.
Dental Implications and Management
Critical Drug Interactions
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QT Prolongation: Certain antipsychotics can prolong the QT interval. The document specifically names amisulpride, droperidol, haloperidol, and ziprasidone as drugs carrying this risk.
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CYP3A4 Inhibitors: The metabolism of many antipsychotics can be affected by CYP3A4 inhibitors. Drugs mentioned include aripiprazole, brexpiprazole, cariprazine, haloperidol, lurasidone, quetiapine, and ziprasidone.
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CNS Depressants: The sedative effects of antipsychotics can be additive when used with other CNS depressants.
Management of Antipsychotic-Induced Adverse Effects
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Dry Mouth (Xerostomia): This is a common side effect of the antipsychotic class that increases caries risk. The document specifically notes that a patient on haloperidol complained of dry mouth.
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Orthostatic Hypotension: This is a known side effect of antipsychotics, requiring caution when repositioning the patient in the dental chair.
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EPSE: The motor effects caused by antipsychotics, such as tremor, can directly impair a patient’s ability to perform effective oral hygiene. Involuntary facial movements can also complicate dental procedures.
Patient Considerations
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It is important to assess the patient’s mental state, their ability to provide informed consent, and their likely level of cooperation.
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Patients taking antipsychotics may have an increased sensitivity to the stress of invasive procedures.
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Consider the need for additional support, shorter appointments, or alternative sedation methods to ensure patient comfort and safety.