The present invention provides a novel method for simultaneously inhibiting the cyclooxygenase COX-2 and 5-lipoxygenase (5-LO) enzymes. The method for the simultaneous dual inhibition of COX-2 and 5-LO is comprised of administering a composition containing an individual and/or a mixture of multiple flavans isolated from a single plant or multiple plants in the Acacia genus of plants to a host in need thereof. The present also includes novel methods for the prevention and treatment of COX-2 and 5-LO mediated diseases and conditions. The method for preventing and treating COX-2 and 5-LO mediated diseases and conditions is comprised of administering to a host in need thereof an effective amount of a composition comprising an individual and/or a mixture of multiple flavans isolated from a single plant or multiple plants in the Acacia genus of plants and a pharmaceutically acceptable carrier. The present invention includes a method for isolating and purifying a composition of flavans having dual specificity for COX-2 and 5-LO from the Acacia genus of plants.