Report muscle pain or weakness with dark, cola-colored urine, which signals rhabdomyolysis.
Before you read
Test yourself first: 5 questions
Question 1 of 5
A client recovering from a myocardial infarction is started on atorvastatin. The nurse teaches the client to report which symptom that may indicate a serious adverse effect?
Answer: B. Statins can rarely cause myopathy and rhabdomyolysis, so clients must report unexplained muscle pain, tenderness, or weakness, which may be accompanied by dark urine. Statins are best taken consistently (some in the evening), do not commonly cause increased appetite, and mild dry mouth is not the warning sign to report.
Question 2 of 5
A client is prescribed atorvastatin for hyperlipidemia. Which statement by the client indicates a need for further teaching?
Answer: A. Statins should generally be taken with attention to muscle symptoms; clients must report unexplained muscle pain, tenderness, or weakness, which may signal myopathy or rhabdomyolysis. Grapefruit juice inhibits the metabolism of many statins and should be avoided. Taking the drug regularly and continuing diet and exercise are correct. Drinking grapefruit juice daily reflects a misunderstanding and needs further teaching.
Question 3 of 5
A client is started on a statin (atorvastatin) for hyperlipidemia. Which symptom should the nurse instruct the client to report promptly?
Answer: B. Statins can rarely cause myopathy and life-threatening rhabdomyolysis, so unexplained muscle pain, tenderness, or weakness, especially with dark or cola-colored urine, must be reported promptly and the drug may be held while a creatine kinase level is checked. Mild constipation, transient flushing, and a slight self-limiting headache are not the hallmark serious adverse effects of statins.
Question 4 of 5
A client taking atorvastatin asks the nurse about foods and drinks to avoid. Which beverage should the nurse advise the client to avoid or limit?
Answer: B. Grapefruit juice inhibits the CYP3A4 enzyme that metabolizes many statins, raising drug levels and the risk of muscle toxicity such as rhabdomyolysis. The client should avoid or strictly limit grapefruit juice. Water, milk, and orange juice do not have this clinically significant interaction with statins.
Question 5 of 5
A client is started on a statin for high cholesterol. The nurse teaches to report:
Answer: B. Statins can cause muscle pain/weakness (and rarely rhabdomyolysis) and liver effects — report unexplained muscle pain, weakness, or dark urine, and have liver enzymes monitored. Grapefruit can increase levels of some statins.
Keep the streak going with more questions like these, each with a full rationale.
What is statins (atorvastatin)?
Statins block the liver enzyme that makes cholesterol, lowering LDL and modestly raising HDL. The two key safety concerns are liver injury and muscle toxicity (myopathy/rhabdomyolysis).
Key points to remember
- Statins lower LDL cholesterol and reduce risk of myocardial infarction and stroke.
- Muscle toxicity ranges from myalgia to rhabdomyolysis, which can cause acute kidney injury.
- Can elevate liver enzymes, so baseline liver function is checked and rechecked if symptoms occur.
- Grapefruit juice inhibits metabolism of atorvastatin and simvastatin, raising drug levels and toxicity risk.
- Combining with fibrates (gemfibrozil) or certain drugs increases the risk of myopathy.
- Atorvastatin may be taken any time of day, while shorter-acting statins like simvastatin are dosed in the evening.
Nursing priorities
- Assess for unexplained muscle pain, tenderness, or weakness and report it promptly.
- Monitor liver function tests at baseline and as clinically indicated.
- Review for grapefruit intake and interacting drugs such as fibrates.
- Reinforce continued lifestyle measures: diet, exercise, and smoking cessation.
Labs & values
Patient teaching
- Report any muscle pain, tenderness, weakness, or dark urine right away.
- Avoid grapefruit and grapefruit juice with atorvastatin and simvastatin.
- Continue a low-fat diet, regular exercise, and other heart-healthy habits.
- Take simvastatin in the evening; atorvastatin may be taken at the same time each day.
- Women of childbearing age should use reliable contraception and notify the provider if pregnancy is planned or suspected.
Red flags: report now
- Report muscle pain or weakness with dark, cola-colored urine, which signals rhabdomyolysis.
- Report right upper quadrant pain, jaundice, dark urine, or marked fatigue suggesting hepatotoxicity.
- Statins are contraindicated in pregnancy because they may harm fetal development.
References
Clinical references for this topic
