Important adverse effects include drug-induced parkinsonism, acute dystonia, akathisia and the risk of tardive dyskinesia with ongoing exposure. Prolactin elevation can cause sexual or reproductive effects. Sedation, dry mouth, constipation and dizziness vary according to the drug’s additional receptor actions. Some medicines also affect cardiac rhythm.
First-generation antipsychotics are an established group of medicines whose antipsychotic action predominantly involves dopamine D2 blockade. They differ substantially in additional receptor effects, dose requirements and formulations. The terms typical and first generation describe a broad family, not a uniform experience of treatment or a ranking of clinical usefulness.
A characteristic profile is not a prediction that every effect will occur. Risk depends on drug, dose, duration, interactions and individual factors. Assessment should ask about symptoms directly, because restlessness or sexual difficulties may not be volunteered. Severe reactions require prompt evaluation. A new movement problem should not automatically be mistaken for psychiatric deterioration and treated by increasing medication. Documenting benefits and unwanted effects supports a more accurate comparison of options and helps identify whether dose adjustment, switching or another intervention should be considered by the prescriber.
Acute dystonia can involve painful sustained muscle contractions, including the neck, jaw or eyes, and can require urgent treatment. Breathing or swallowing difficulties need immediate medical attention. This differs from slower-developing parkinsonism and from tardive dyskinesia. Knowing the distinctions helps people describe new symptoms accurately and prevents all movement problems from being treated as one interchangeable adverse effect.
Further reading: DailyMed prescribing information (1); DailyMed prescribing information (2).
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