According to a new study in the Journal of the American College of Cardiology, Pfizer’s COVID drug Paxlovid “can have dangerous interactions with common medications.”
The Daily Mail reports that Paxlovid has been prescribed to “millions of vulnerable Americans with underlying health conditions” amid claims the drug reduces the “risk of death by up to 90 percent.”
The new study shows that patients can have severe adverse reactions when combining Paxlovid with common heart disease medications such as statins and blood thinners.
The Daily Mail reported that “researchers from Lahey Hospital and Medical Center, Harvard Medical School and other US institutions found the Covid drug can increase the risk of developing blood clots when taken with blood thinners.”
The study recommends patients discuss their health history and medications with their physician before taking Paxlovid.
Dr. Sarju Ganatra, director of the cardio-oncology program at Lahey Hospital and Medical Center in Massachusetts, commented on the findings in the report:
“Awareness of the presence of drug-drug interactions of Paxlovid with common cardiovascular drugs is key. System-level interventions by integrating drug-drug interactions into electronic medical records could help avoid related adverse events.”
Ganatra continued: “The prescription of Paxlovid could be incorporated into an order set, which allows physicians, whether it be primary care physicians or cardiology providers, to consciously rule out any contraindications to the co-administration of Paxlovid.”
Ganatra advised: “Consultation with other members of the health care team, particularly pharmacists, can prove to be extremely valuable. However, a health care provider’s fundamental understanding of the drug-drug interactions with cardiovascular medications is key.”
Generally speaking, the drug Paxlovid is created by merging the two antivirals, nirmatrelvir and ritonavir.
Dr Dan Barouch, Director of the Center for Virology and Vaccine Research at Beth Israel Deaconess Medical Center in Boston, told CNN:
“Ritonavir, is a nonspecific drug that inhibits metabolism and increases the dose of the other drug. But the ritonavir in Paxlovid also can inhibit the metabolism of other drugs. So you have to be really careful when you prescribe Paxlovid for people who are on certain blood thinners, cardiac medications, statins and other drugs.”
The Daily Mail included the following information regarding combining Paxlovid with other drugs:
WHICH COMBOS CAUSE THE WORST SIDE EFFECTS?
Five of the most important cardiovascular drug interactions with Paxlovid to be aware of include:
Antiarrhythmic agents are used to manage abnormal heart rhythm. Many of these drugs are metabolized in a way that increases plasma levels when co-administered with Paxlovid. While it may be possible to start Paxlovid after 2-2.5-day temporary discontinuation of the antiarrhythmic agents, this may not be feasible from a practical standpoint. Clinicians are advised to consider alternative COVID-19 therapies and avoid co-administration of these agents with Paxlovid. Sotalol, another antiarrhythmic agent, is renally cleared and does not interact with Paxlovid.
Antiplatelet agents and anticoagulants
Antiplatelet agents are used for the treatment of coronary artery disease, particularly if a patient has received a stent. Aspirin and prasugrel are safe to co-administer with Paxlovid. There is an increased risk of blood clots when Paxlovid is given alongside clopidogrel and an increased risk of bleeding when given with ticagrelor. When possible, these agents should be switched to prasugrel. If patients have contraindication to taking prasugrel, then co-administration of Paxlovid should be avoided and alternative COVID-19 therapies should be considered.
Anticoagulants, or blood thinners used to treat or prevent blood clots, such as warfarin may be co-administered with Paxlovid but require close monitoring of clotting factors in bloodwork. The plasma levels of all direct oral anticoagulants increase when co-administered with Paxlovid, therefore dose adjustment or temporary discontinuation and use of alternative anticoagulants may be required.
Co-administration of simvastatin or lovastatin with Paxlovid can lead to increased plasma levels and subsequent muscle weakness (myopathy) and rhabdomyolysis, a condition in which the breakdown of muscle tissue releases a damaging protein into the bloodstream. These agents should be stopped prior to initiation of Paxlovid. A dose reduction of atorvastatin and rosuvastatin is reasonable when co-administered with Paxlovid. The other statins are considered safe when given along with Paxlovid.
Plasma concentration of ranolazine, used to treat angina and other heart-related chest pain, is exponentially increased in the presence of CPY450 inhibitors like Paxlovid, thereby increasing the risk of clinically significant QT prolongation and torsade de pointes (a type of arrhythmia). Co-administration of Paxlovid is therefore contraindicated. Temporary discontinuation of ranolazine is advised if prescribing Paxlovid.
The plasma levels of immunosuppressive agents prescribed for patients who have undergone heart transplantation exponentially rise to toxic levels when co-administered with Paxlovid. Temporary reduction of dosing of immunosuppressive agents would require frequent monitoring and be logistically difficult. Therefore, alternative COVID-19 therapies should be considered in these patients.
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