The World Health Organization (WHO) in its Alma Ata Declaration, 1978, focuses on the development, promotion and recognition of the traditional medical systems. India has taken steps in this direction by recognising Unani medicine with other traditional medical systems practised in India. Presently, Government is promoting integration of the recognised traditional medical systems with conventional medicine at the national level, as an interdisciplinary approach to providing better patient-centred care. Bioethics is a field of enquiry that examines ethical issues and dilemmas emerging from medical care and research involving humans. Although the term ‘bioethics’ was first mentioned in 1927 and later established as a distinct discipline in 1970s, the ethical principles in various contexts had been described centuries ago in the classical texts pertaining to traditional medical systems. Since ethics as a code of conduct was followed by ancient Unani physicians to safeguard the interests of humanity when providing healthcare, it was felt that a review of classical Unani manuscripts should be attempted to give an insight into codes of conduct described by various Unani physicians. In this paper, a 10th century book, “Kamilussanah” authored by Ali ibn Abbas al-Majoosi, also known as Majoosi (930-994 CE), is reviewed through the prism of ethics.