Our expert says:
There can be numerous possible causes for this, but i would be wise to rather urgently inform his doctor ( who can check out whether any of his current meds might be causing this ; and a urologist who might be able to consider other possible causes for this, which is called Priapism.
Among the drugs which can cause this are Zuprexa, and Risperdal, which could be medications used for his schizophrenia, and also in some people, some antidepressants.
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