If a doctor's advice based on old scientific beliefs harms a patient, who should be held responsible?

The doctor, the patient went in to seek help in the first place and if at the advice or doing of a doctors their condition was somehow made worse or they were harmed thats on the doctor as it was there responsibility to protect and care for the patient’s health.

The doctor unless there was some kind of user agreement/ terms of use or a policy that the patient had to agree on, or if citizens are more likely to view doctors as authority and that it’s too risky to not follow the advice as a result.