More people than previously thought could be at higher risk of having a stroke caused by their antipsychotic drugs, say UK scientists.
Previous research suggested only some types of the drug increased the risk, particularly for people with dementia.
However a study published in the British Medical Journal says all forms of antipsychotics boost the risk, in all patients.
A mental health charity said patients on the drugs must be closely monitored.
Antipsychotic drugs are generally used to control psychotic symptoms in patients with disorders such as schizophrenia, and some severe forms of depression.
They are also thought to be widely used to control symptoms of dementia such as aggression, leading to accusations they were being used unnecessarily as a "chemical cosh" in some circumstances.
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