Side effects: Most common adverse reactions reflect their effects on the GI system. These include flatulence, abdominal pain, cramps, nausea, vomiting and constipation. CNS reactions can include headache, dizziness, blurred vision, or insomnia. Increased concentrations of liver enzymes commonly occur, and acute liver failure has commonly been associated with the use of atorvastatin (McKenna & Lim, 2014).