Trainer George Weaver is one of several trainers whose horses have tested positive for metformin who will have their suspensions deferred as the Board of Directors of the Horseracing Integrity and Safety Authority has requested additional review of the drug which is heavily prescribed and used to treat diabetes in people. "In line with HISA's Anti-Doping and Medication Control requirements, metformin is included in the Prohibited Substances List because there is no recognized therapeutic use for the substance in horses involved in Thoroughbred racing," HISA Board Chairman Charles Scheeler said...