Pharmaceutics is a branch of Pharmacy that deals with the formulation of drugs
Pharmacology is a branch of pharmacy that deals with the study of the effects of drugs on the functions of living systems. Pharmacology is mainly concerned with Pharmacodynamics (Biochemical and Moleclar), Pharmacokinetics, Chemotherapy and Systemic pharmacology. It acts as a link to various disciplines such as Clinical therapeutics, Genetics, Biotechnology, Veterinary Medicine, Pathology, Chemistry, Psychology etc.
Pharmacognosy is a branch of pharmacy that deals with the study of crude drugs. Pharmacognosy is mainly concerned with Natural Drugs ( Plant Animal Mineral and Micro organisms).It acts as a link to various disciplines such as Phytochemistry, Phytopharmacology, Pharmacobiotechnology and natural drug analysis etc.
