If you will be taking isosorbide mononitrate for a long time, it is very important that your doctor check your progress at regular visits to make sure that isosorbide mononitrate is working properly. Blood tests may be needed to check for unwanted effects.
Do not take riociguat (Adempas®), sildenafil (Viagra®), tadalafil (Cialis®), or vardenafil (Levitra®) while you are using isosorbide mononitrate. Using these medicines together may lower your blood pressure and cause blurred vision, dizziness, lightheadedness, or fainting. If you are taking these medicines and you experience an angina attack, you must go to the hospital right away.
Isosorbide mononitrate may cause headaches. These headaches are a sign that the medicine is working. Do not stop using the medicine or change the time you use it in order to avoid the headaches. If you have severe pain, talk with your doctor.
Dizziness, lightheadedness, or faintness may occur, especially when you get up quickly from a lying or sitting position. Getting up slowly may help.
Dizziness, lightheadedness, or fainting is also more likely to occur if you drink alcohol, stand for long periods of time, exercise, or if the weather is hot. While you are taking isosorbide mononitrate, be careful to limit the amount of alcohol you drink. Also, use extra care during exercise or hot weather or if you must stand for long periods of time.
Do not stop using isosorbide mononitrate without checking first with your doctor. Your doctor may want you to gradually reduce the amount you are using before stopping it completely.
Make sure any doctor or dentist who treats you knows that you are using isosorbide mononitrate. You may need to stop using isosorbide mononitrate several days before you have medical tests.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
