A client is started on gemfibrozil (Lopid) to assist in the lowering of triglyceride level. Which of the following side effects is associated with gemfibrozil (Lopid)?

A. Increased creatinine clearance is not a common effect of gemfibrozil; rather, it may lead to liver function changes or muscle-related side effects. B. Gemfibrozil does not typically decrease prothrombin time (PT); this option does not relate to its mechanism of action. C. Hyperkalemia is not a typical side effect of gemfibrozil; it may be more relevant to other medications, particularly those affecting the kidneys. D. Gallstones are a known side effect of gemfibrozil, as the drug can increase biliary cholesterol saturation, leading to the formation of stones.