How Fast Does Rimadyl Work. Within three hours after administering rimadyl, the drug reaches its highest concentration in the bloodstream. Because human nsaids cause gastrointestinal problems in a large percentage of dogs, vets have typically never used them beyond a one to three day period.

How quickly does rimadyl work? By reducing the inflammation associated with osteoarthritis, you also reduce the pain. In cases when arthritic or joint pain is present, you can treat this condition using the medication listed above.