Final answer:
Donald should report any muscle weakness or tenderness and dark urine to his healthcare provider immediately, as these can indicate rhabdomyolysis, a serious side effect of atorvastatin.
Step-by-step explanation:
Donald has been diagnosed with hyperlipidemia and prescribed atorvastatin, which belongs to a class of medications known as statins. These are typically used to reduce cholesterol and the risk of coronary artery disease. However, one rare but serious side effect of statins is rhabdomyolysis, a condition involving the breakdown of muscle tissue that can lead to kidney damage. Among the provided options, Donald should be instructed to report muscle weakness or tenderness and dark urine to his healthcare provider immediately, as these are potential signs of rhabdomyolysis.