The purpose of ICMR guidelines and Indian GCP are subject's rights, safety and wellbeing . But contentwise they are not one and the same. The ICMR Ethical Guidelines For Biomedical Research on Human Participants, as name indicates basically a Ethical guideline for a researcher and addresses the ethical issues like role of Ethics Committee, Informed consent, etc. Whereas the Indian GCP is a guideline ad ressing both the ethics and required practice (Good Clinical Practice) during the conduct of the Clinical Trial. The Indian GCP elaborates the practice in terms of Investigator, Sponsor, CRO (Monitor), etc and guides sponsor/Investigator for the conduct of the study. Where as ICMR talks generally in terms of only Ethics.
Hence to understand ethics we need to read ICMR guidelines and to put that Ethics in to practice we require Indian GCP. One of the best examples is Indian GCP defines what needs to be done by Investigator and Sponsor during the conduct of the study. However, the same can not be seen in ICMR guidelines except Ethics.
Even the Origin of both is different. ICMR Bioethical Guidelines are by Indian Council for Medical Research (ICMR) where as Indian GCP is by CDSCO.
Please reply back for any further clarifications.