Nogle af disse stoffer, som fluoxetin, indinavir og ritonavir, har vist sig at hæmme CYP3A4- formidlet metabolisme af nifedipin in vitro.
Some of these substances, like fluoxetine, indinavir and ritonavir, have been demonstrated to inhibit the CYP3A4 mediated metabolism of nifedipine in vitro.