Compared to nifedipine monotherapy, blood pressure was lower in the presence of doxazosin. To turn on the cookies for your internet browser, we suggest you follow the steps in your browser help section, options or preferences selections now. Procardia XL should be used cautiously if you have any stomach or intestinal narrowing. This reduces the demand adalat no doctors prescription of the heart for oxygen--another mechanism by which CCBs treat and prevent angina. Antiviral Drugs Amprenavir, atanazavir, delavirine, fosamprinavir, indinavir, nelfinavir and ritonavir, as CYP3A inhibitors, can inhibit the metabolism of nifedipine and increase the exposure to nifedipine. Non-Cardiovascular Drugs Antifungal Drugs Ketoconazole, itraconazole and fluconazole are CYP3A inhibitors and can inhibit the metabolism of nifedipine and increase the exposure to nifedipine during concomitant therapy.