Get emergency medical help if you have signs of an allergic reaction to gemfibrozil: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
In rare cases, gemfibrozil can cause a condition that results in the breakdown of skeletal muscle tissue, leading to kidney failure. Call your doctor right away if you have unexplained muscle pain, tenderness, or weakness especially if you also have fever, unusual tiredness, and dark colored urine.
Also call your doctor at once if you have:
sharp pain in your upper stomach (especially after eating);
jaundice (yellowing of your skin or eyes);
pain or burning when you urinate;
blurred vision, eye pain, or seeing halos around lights; or
low blood cell counts - pale skin, easy bruising, unusual bleeding, unusual tiredness, feeling light-headed or short of breath, cold hands and feet.
Common gemfibrozil side effects may include:
stomach pain, indigestion, diarrhea;
numbness or tingly feeling;
dizziness, drowsiness;
blurred vision;
muscle or joint pain; or
loss of interest in sex, impotence.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Gemfibrozil side effects (more detail)
