RT Journal Article T1 High rate of major drug-drug interactions of lopinavir-ritonavir for COVID-19 treatment A1 Macías, Juan A1 Pinilla, Ana A1 Lao-Dominguez, Francisco A. A1 Corma, Anaïs A1 Contreras-Macias, Enrique A1 González-Serna, Alejandro A1 Gutierrez-Pizarraya, Antonio A1 Fernández-Fuertes, Marta A1 Morillo-Verdugo, Ramón A1 Trigo, Marta A1 Real, Luis M. A1 Pineda, Juan A. K1 COVID-19 K1 Antiviral agents K1 Drug combinations K1 Drug Interactions K1 Lopinavir K1 Ritonavir K1 Spain K1 Antivirales K1 Combinación de medicamentos K1 Interacciones farmacológicas K1 Inhibidores de proteasas K1 España AB The impact of drug-drug interactions (DDI) between ritonavir-boosted lopinavir (LPV-r) to treat patients with coronavirus disease 2019 (COVID-19) and commonly used drugs in clinical practice is not well-known. Thus, we evaluated the rate and severity of DDI between LPV-r for COVID-19 treatment and concomitant medications. This was a cross-sectional study including all individuals diagnosed of SARS-CoV-2 infection treated with LPV-r and attended at a single center in Southern Spain (March 1st to April 30th, 2020). The frequency [95% confidence interval (95% CI)] of potential and major DDI were calculated. Overall, 469 patients were diagnosed of COVID-19, 125 (27%) of them were prescribed LPV-r. LPV-r had potential DDI with concomitant medications in 97 (78%, 95% CI 69-85%) patients, and in 33 (26%, 95% CI 19-35%) individuals showed major DDI. Twelve (36%) patients with major DDI and 14 (15%) individuals without major DDI died (p = 0.010). After adjustment, only the Charlson index was independently associated with death [adjusted OR (95% CI) for Charlson index ≥ 5: 85 (10-731), p < 0.001]. LPV-r was discontinued due to side effects in 31 (25%) patients. Management by the Infectious Diseases Unit was associated with a lower likelihood of major DDI [adjusted odds ratio (95% CI): 0.14 (0.04-0.53), p = 0.003). In conclusion, a high frequency of DDI between LPV-r for treating COVID-19 and concomitant medications was found, including major DDI. Patients with major DDI showed worse outcomes, but this association was explained by the older age and comorbidities. Patients managed by the Infectious Diseases Unit had lower risk of major DDI. PB Springer Nature YR 2020 FD 2020-12-01 LK http://hdl.handle.net/10668/3438 UL http://hdl.handle.net/10668/3438 LA en NO Macías J, Pinilla A, Lao-Dominguez FA, Corma A, Contreras-Macias E, González-Serna A, et al. High rate of major drug–drug interactions of lopinavir–ritonavir for COVID-19 treatment. Sci Rep. 2020 Dec 1;10(1):20958 DS RISalud RD Apr 19, 2025