According to this AMA article
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<font size=+1> Is is not proper for clinicians to use placebo therapy in everyday practice without telling patients first, according to the American Medical Association's ethics council.

A report by the Council on Ethical and Judicial Affairs (CEJA) said that it is unethical for a physician to use a placebo in the guise of therapy without the "knowledge and cooperation of the patient."</font>

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This JOURNAL OF MEDICAL ETHICS article says placebo use doesn't always involve deception.

However, I agree with this AMA article , which states placebo use in routine clinical practice insufficiently engages the patient in the treatment plan, breaching the patient-physician relationship.