The following undesirable effects had a rate greater than placebo and have been reported among 1543 patients administered Dynastat 20 or 40 mg as a single or multiple dose (up to 80 mg/ day) in 12 placebo controlled studies, including dental, gynaecologic, orthopaedic surgery or coronary artery bypass graft surgery as well as pre-operative administration in dental and orthopaedic surgeries.