Many doctors cater to patients' demands that they be prescribed antibiotics for their colds  However, colds are caused by viruses, and antibiotics have no effect on viruses, and so antibiotics have no effect on colds  Such treatments are also problematic because antibiotics can have dangerous side effects
So doctors should never prescribe antibiotics to treat colds
A doctor should attempt to prescribe every drug that is likely to affect the patient's health positively.