OBJECTIVE: Drug interactions are a common cause of morbidity and mortality and may require prompt discontinuation of therapeutic regimens due to harmful side effects. Patients with acute coronary syndromes are likely to be prescribed multiple medications that are metabolized through the cytochrome P450 system, increasing the probability for drug interaction. Atorvastatin and simvastatin are both well known to interact with the oral P2Y12 agent ticagrelor. The purpose of this paper is to describe the interaction of ticagrelor with rosuvastatin leading to rhabdomyolysis, which is less clearly defined in the literature. METHOD: We report a case of a 74-year-old male who presented with bilateral lower extremity weakness and difficulty ambulating for one month after being prescribed ticagrelor for a drug eluting stent, in the setting of already being on rosuvastatin. His clinical picture and laboratory findings were consistent with a diagnosis of rhabdomyolysis. His medications were adjusted to a regimen of clopidogrel and alirocumab. One month later, he returned to his baseline status. RESULTS: The mechanism of interaction between rosuvastatin and ticagrelor appears to be multifactorial. It may be caused by CYP450-mediated metabolism from a small amount of crossover between isoenzymes. Ticagrelor may also cause acute kidney injury, increasing the concentration of rosuvastatin. Other mechanisms of interaction include genetic differences in the organic anion transporter polypeptides and transportation through p-glycoprotein. CONCLUSION: Future pharmacokinetic studies are warranted to better understand the interaction.
OBJECTIVE: Drug interactions are a common cause of morbidity and mortality and may require prompt discontinuation of therapeutic regimens due to harmful side effects. Patients with acute coronary syndromes are likely to be prescribed multiple medications that are metabolized through the cytochrome P450 system, increasing the probability for drug interaction. Atorvastatin and simvastatin are both well known to interact with the oral P2Y12 agent ticagrelor. The purpose of this paper is to describe the interaction of ticagrelor with rosuvastatin leading to rhabdomyolysis, which is less clearly defined in the literature. METHOD: We report a case of a 74-year-old male who presented with bilateral lower extremity weakness and difficulty ambulating for one month after being prescribed ticagrelor for a drug eluting stent, in the setting of already being on rosuvastatin. His clinical picture and laboratory findings were consistent with a diagnosis of rhabdomyolysis. His medications were adjusted to a regimen of clopidogrel and alirocumab. One month later, he returned to his baseline status. RESULTS: The mechanism of interaction between rosuvastatin and ticagrelor appears to be multifactorial. It may be caused by CYP450-mediated metabolism from a small amount of crossover between isoenzymes. Ticagrelor may also cause acute kidney injury, increasing the concentration of rosuvastatin. Other mechanisms of interaction include genetic differences in the organic anion transporter polypeptides and transportation through p-glycoprotein. CONCLUSION: Future pharmacokinetic studies are warranted to better understand the interaction.
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