 According to the Biopharmaceutical Classification System (BCS) drug substances are classified to four classes upon their solubility and permeability.Aceclofenac falls under the BCS Class II, poorly soluble and highly permeable drug.Aceclofenac works by inhibiting the action of cyclooxygenase (COX) that is involved in the production of prostaglandins (PG) which is accountable for pain, swelling, inflammation and fever.