The Short Answer
Antipsychotics (especially haloperidol and risperidone), SSRIs, and antiemetics like metoclopramide are the top three culprits, with first-generation antipsychotics causing akathisia in up to 60% of users [1][9].
First-generation antipsychotics (haloperidol, chlorpromazine, fluphenazine) carry the highest risk—25–60% of patients experience akathisia within 3–7 days. These older drugs block dopamine powerfully and non-selectively, making them potent akathisia triggers. Second-generation agents (risperidone, olanzapine, aripiprazole) are gentler, affecting 10–25% of users [1].
SSRIs and SNRIs (sertraline, paroxetine, venlafaxine) cause akathisia in 5–15% of patients, usually 1–4 weeks after starting or increasing the dose. The mechanism differs slightly—serotonin reuptake inhibition can indirectly reduce dopamine tone in movement circuits, creating similar restlessness [1].
Antiemetics and prokinetics (metoclopramide, prochlorperazine) are often overlooked culprits. Metoclopramide, commonly prescribed for nausea and gastroparesis, triggers akathisia in 15–30% of users because it blocks dopamine in the chemoreceptor trigger zone. Always ask your doctor if a new medication could be the cause [1][9].
Try This Today
Create a timeline: write down the exact date you started each new medication and when the restlessness began. Bring this list to your appointment—it helps your doctor pinpoint the culprit and decide whether to reduce the dose, switch medications, or add a beta-blocker [1].