<p>Co-administration of Lopinavir and Ritonavir is contraindicated with potent CYP3A inducers where significantly reduced lopinavir plasma concentrations may be associated with the potential for loss of virologic response and possible resistance and cross resistance. It is also contraindicated with Alpha 1 Adrenoreceptor Antagonist (Alfuzosin), Antimycobacterial (Rifampin), Ergot Derivatives ( Dihydroergotamine, ergotamine, methylergonovine), Gl Motility Agent (Cisapride), HMG-CoA Reductase Inhibitors (Lovastatin, simvastatin), PDE5 Enzyme Inhibitor (Sildenafil, when used for the treatment of pulmonary arterial hypertension), Neuroleptic (Pimozide) Sedative/Hypnotics (Triazolam; orally administered midazolam).</p>