Rev Esp Quimioter 2022; 35(4):357-361

Interactions listed in the Paxlovid fact sheet, classified according to risks, pharmacological groups, and consequences

JOSÉ RAMÓN AZANZA, JOSEP MENSA, JUAN GONZÁLEZ DEL CASTILLO, MANUEL LINARES RUFO, JOSÉ MARÍA MOLERO, NATALIA MADERO VALLE, JOSÉ BARBERÁN

Published: 13 July 2022

http://www.doi.org/10.37201/req/054.2022

Paxlovid (nirmatrelvir plus ritonavir) is a new oral antiviral therapeutic for the treatment of COVID-19. Nirmatrelvir is an inhibitor of SARS-CoV-2 main protease, while ritonavir is used as a CYP3A inhibitor in low doses to slow the metabolism of nirmatrelvir, thus enhancing their therapeutic effect. The isoenzyme CYP3A4 is responsible for at least part of the oxidative metabolism of approximately 60% of available medications and ritonavir is therefore a significant source of drug interactions. We describe here the drugs that are contraindicated or should be used with or without precautions when Paxlovid (nirmaltrevir plus ritonavir) should be administered according to each fact sheet in force at the Spanish Agency for Medicines and Health Products.

Rev Esp Quimioter 2022; 35(4):357-361 [Full-text PDF]