Lipitor is a drug designed to lower cholesterol levels. With current sales of Lipitor exceeding $13 billion each year, it has become the best selling drug ever. One dosage level of Lipitor is provided with tablets containing 10 mg of the drug atorvastatin. If the manufacturing process is set up to produce tablets containing between 9.5 mg and 10.5 mg of atorvastatin, why is it important to monitor the manufacturing process over time? What would be a possible adverse consequence of a Lipitor manufacturing process that is not monitored?