CRIXIVAN with or without ritonavir should not be administered concurrently with amiodarone, terfenadine, cisapride, astemizole, alprazolam, triazolam, midazolam administered orally (for caution on parenterally administered midazolam, see section 4.5), pimozide, ergot derivatives, simvastatin or lovastatin (see section 4.4).