Doc is it safe to give thorazine (chlorpromazine) for persisting hiccups to heart patient?

Yes: Thorazine (chlorpromazine) is a powerful sedative and antipsychotic that also has been shown to help people with persistent hiccoughs. It can cause mild light headedness and dry mouth from anti-cholinergic activity, which can cause lead to light headedness in older people or those with heart failure. Thorazine is generally well tolerated, but talk to your cardiologist.

Maybe: There is very little evidence that it helps, so if practicing evidence based medicine, it is not recommended.

Talk to doctor: Thorazine (chlorpromazine) can help persistent hiccups, but you should ask the prescribing physician about giving it to a particular patient. Some heart patients have arrhythmias, and one's personal cardiologist would be best to answer that question.