Widely given to patients with type 2 diabetes, metformin has been linked to reducing the risk for many types of cancers. The medication, however, may not be effective against one certain cancer.

If you've been taking Actos or Takeda for more than a year to control your type 2 diabetes, you will want to be in touch with your family physician or endocrinologist. A link with bladder cancer has been discovered.

Actos and Competact, two top-selling type 2 diabetes drugs, have been pulled off the markets in France and Germany following studies linking the medications to bladder cancer.