See also How to Use section.

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Lopinavir/ritonavir interacts with many medications. Some products that may interact with this drug include: cobicistat, certain HIV medications (such as fosamprenavir, tipranavir), orlistat.

Other medications can affect the removal of lopinavir/ritonavir from your body, which may affect how lopinavir/ritonavir works. Examples include apalutamide, rifampin, St. John's wort, among others.

Lopinavir/ritonavir can speed up or slow down the removal of other medications from your body, which may affect how they work. Examples of affected drugs include certain alpha blockers (such as alfuzosin, tamsulosin), certain inhaled drugs to treat breathing problems (such as fluticasone, salmeterol), drugs to treat erectile dysfunction-ED or pulmonary hypertension (such as sildenafil, tadalafil), ergot drugs (such as ergotamine, dihydroergotamine), pimozide, rivaroxaban, certain sedatives (such as midazolam, triazolam), certain statins (such as lovastatin, simvastatin), among others.

This medication may decrease the effectiveness of hormonal birth control such as pills, patch, or ring. This could cause pregnancy. Discuss with your doctor or pharmacist if you should use reliable backup birth control methods while using this medication. Also tell your doctor if you have any new spotting or breakthrough bleeding, because these may be signs that your birth control is not working well.

Many drugs besides lopinavir/ritonavir may affect the heart rhythm (QT prolongation), including pacritinib, among others.