... taking isosorbide mononitrate 10mg twice a day to treat angina. If I stop taking mononitrate for a couple of days will it be safe to take cialis or similar? I am also prescribed carvedilol 3.125, dispensable aspirin 75mg and lanzoprasol 30mg. Since being on these prescribed medication I have suffered from erectile distinction. My wife and I used to have a very satisfactory sex life