The word “pharmakon” translated as ‘drug’ and meaning both ‘remedy’ and ‘poison’. Pharmacopoeia is an official book published by the government containing list of medicines with information about sources, description, identification, preparation and standardisation. Pharma-co-logy is a branch of medicine that encompasses drug interaction, toxicology, pharma-co-dynamics and pharma-co-kinetics. Pharmacodynamics is the study of drug action (biochemical) on living organism. Homeopathic medicines are prepared through a specific nanopharmacological process of potentisation. Pharmacy is the art and science of preparation and standardisation of drugs for use and dispensing them as medicines. Pharma-co-gnosy is the study of physical,chemical,biological and biochemical properties of drugs of natural origin. A pharmacist/chemist dispenses medicines in a pharmacy shop.