Himpyrin is a clinically tested herbal medicine to treat fever, inflammation and pain in dogs and cats. It is antipyretic (treats fevers from many underlying causes), analgesic (relieves pain) and is an anti-inflammatory for long term health benefits. Effective in cases of injury or surgery.In potent liquid drop form, Himpyrin is a natural antipyretic (reduces fever) that works by inhibiting the enzymes cyclooxygenase (COX) 1 and 2 and preventing the synthesis of prostaglandins, hormones that are made at sites of tissue damage or infection, where they cause inflammation, pain and fever as part of the healing process. The action reduces fever in pets.