Risperidone
Risperidone is a antipsychotic found in 3 medicines sold in India, such as Sizodon 2, Sizodon 1, Sizodon 4. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.
What it is used for
Treats schizophrenia, bipolar disorder and some behaviour problems.
How it works
An atypical antipsychotic for schizophrenia, bipolar mania and severe aggression in autism.
How to take it
Usually 1 to 6 mg a day in one or two doses.
Common side effects
- Drowsiness
- Weight gain
- Dizziness
- Raised sugar and cholesterol
- Breast enlargement or milk leakage
Get medical help straight away if
- High fever with stiff muscles and confusion
- Uncontrolled movements
- Fainting or palpitations
Be careful
Can cause stiffness or raised prolactin.
Other medicines and interactions
More drowsiness with alcohol and sedatives. Heart rhythm risk with other QT-prolonging medicines. Smoking changes olanzapine levels.
Pregnancy and breastfeeding
Often continued in pregnancy when needed, under specialist care. Ask about breastfeeding.
Brands of Risperidone (3)
Common questions
What is Risperidone used for?
Treats schizophrenia, bipolar disorder and some behaviour problems.
How does Risperidone work?
An atypical antipsychotic for schizophrenia, bipolar mania and severe aggression in autism.
How should I take Risperidone?
Usually 1 to 6 mg a day in one or two doses.
What are the side effects of Risperidone?
Common: Drowsiness, weight gain, dizziness, raised sugar and cholesterol, breast enlargement or milk leakage. Get help straight away for: High fever with stiff muscles and confusion, uncontrolled movements, fainting or palpitations.
Does Risperidone interact with other medicines?
More drowsiness with alcohol and sedatives. Heart rhythm risk with other QT-prolonging medicines. Smoking changes olanzapine levels.
Is Risperidone safe in pregnancy and breastfeeding?
Often continued in pregnancy when needed, under specialist care. Ask about breastfeeding.
Does Risperidone need a prescription in India?
Yes. In India it is a prescription (Schedule H) medicine, so a pharmacist should sell it only with a doctor's prescription.
Which brands contain Risperidone?
Sizodon 1, Sizodon 2, Sizodon 4.
Sources and further reading
- Risperidone: NHS · MedlinePlus
NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.
Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.
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