🩺 NHS Description
Risperidone is a medicine that helps the symptoms of mental health conditions such as: schizophrenia (where you may see, hear or feel things that are not there or you believe things that are not true or you feel unusually suspicious or have muddled thoughts) the mania symptoms of bipolar disorder, where your mood changes between feeling highly excited (mania) and very low (depression) aggressive or agitated (frustrated, nervous) behaviour in children over 5 years old, or young people with conditions such as contact disorder or autism aggressive or agitated (frustrated, nervous) behaviour in adults with Alzheimer's disease It's an antipsychotic medicine that works by affecting chemicals in your brain, such as dopamine and serotonin. It does not cure your condition, but it can help the symptoms. Risperidone is only available on prescription. It comes as tablets, including tablets that dissolve in your mouth, and a liquid that you swallow. It can also be given as an injection (for schizophrenia only).
🩺 Main Uses
Schizophrenia; bipolar mania; irritability in autism (some regions).
🧪 The Science & Facts
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Half‑life (t½)
20 h
How long the drug hangs around. Longer half‑life = slower changes.
Time to Peak (Tmax)
1.5 h
Roughly when you feel the main effect after a dose.
What it hits (receptors)
Primary:
High prolactin risk due to strong D2 blockade in tuberoinfundibular pathway.
How your body processes it (metabolism)
Poor metabolisers (CYP2D6) have longer parent t½; active moiety drives exposure. • Paliperidone (9‑OH‑risperidone)
⚠️ Warnings
- Watch for prolactin elevation (can cause lactation, sexual dysfunction), tremors, restlessness. Long-term use can blunt emotions or motivation.
⏬ Taper & Withdrawal
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If you’re reducing
Go slow if reducing; watch for rebound psychosis/anxiety and prolactin withdrawal headaches.
Possible withdrawal
Sleep disturbance, anxiety, irritability; relapse risk if rapid.
Info here is educational, not medical advice. Always taper with prescriber support if possible.
🧠 Trusted External Sources Last reviewed 22 Aug 2025, 21:02 by Connor O’Driscoll
🔗 Interaction Checker
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Class warning: ↑ mortality in elderly with dementia‑related psychosis. Not approved for this use.
This is a plain‑English summary of headline safety warnings. Talk to a clinician before changing any medication.