What are the reasons not to use Levitra?

Below there’s some data from Levitra package instruction, approved by FDA. In fact, you are to speak of with your pharmacist or physician any other medicines you’re using for the moment and the troubles with health you have, because this instructions can be not full or up-to-date. You should also take and look through the entire content of insert before using Levitra. Here you can download the instruction from the FDA web service:
http://www.fda.gov/cder/foi/label/2003/021400lbl.pdf

Don’t use Levitra if you:

use any medication named “nitrates” (Look through "What important information should you know about Levitra?"). Nitrates are usually taken to cure angina. Angina is a sign of heart disease and can be a reason of chest pain, jaw or down your hand.
medications, named nitrates, contain nitroglycerin which is included in pills, ointments, patches, sprays or pastes. Nitrates can also be present in various medications as isosorbide mononitrate or isosorbite dinitrate. Some relaxing drugs, named “poppers”, also include nitrates, e.g. butyl nitrate and amyl nitrate. Don’t take Levitra if you’re taking these remedies. Consult with you pharmacist or doctor if you can’t ensure that your remedies aren't nitrates.
take entertaining drugs as “poppers", e.g. butyl nitrate and amyl nitrate.
use medical remedies named “alpha-blockers". Doctors sometimes prescribe alpha-blockers for men with high blood pressure or prostate problems. If you use Levitra with alpha-blockers, you risk to let your blood pressure fall to a very low, dangerous level. You could feel weak and dizzy.
your doctor has forbidden you to live your sexual life due to health troubles. Sexual life can become an additional strain for the heart, especially if you have overcome a heart disease or a heart attack.
have allergy on Levitra or its components. The active Levitra component is vardenafil.

Active Component: vardenafil hydrochloride
Inactive Components: crospovidone, magnesium stearate, polyethylene glycol, yellow ferric oxide, red ferric oxide, microcrystalline cellulose, colloidal silicon dioxide, hypromellose, and titanium dioxide.

Before you use Levitra, inform you doctor of all your health troubles, as well as if you:

have problems with heart, e.g. heart failure, angina, irregular heartbeats or have overcome a heart attack. Learn from your health provider if it’s safe for your health to have sex.

have high blood pressure difficult to control or low blood pressure
have overcome a stroke
or any of your relatives have overcome a heart condition called long QT syndrome (prolongation of the QT interval)
have troubles with liver
have troubles with liver and need dialysis
have a rare eye dsease, run genetically, called retinitis pigmentosa
have stomach ulcers
have troubles with bleeding
have Peyronie’s disease or a irregular phallus form
have experienced an erection which had the duration over 4 hours
have troubles with blood cells, for example, multiple myeloma, leukemia, or sickle cell anemia

Can other remedies influence Levitra?

Inform your doctor about all the medical remedies you use, as well as vitamins, herbal supplements, and non-prescription and prescription medicines. Levitra and other medical remedies can exert influence on each other. Always consult with your health provider before taking or stopping to take any medications. Particularly inform your doctor if you use any of medications mentioned below:

medications named nitrates (Look through "What important information should you know about Levitra?") medications named alpha-blockers. Flomax® (tamsulosin HCl), Minipress® (prazosin HCl), Hytrin® (terazosin HCl), Cardura® (doxazosin mesylate), Uroxatral® (alfuzosin HCl) are in their number. medications that cure irregulat heartbeat. Procainamide, sotalol, quinidine, and amiodarone are in their number.

indinavir sulfate (Crixivan®) or ritonavir (Norvir®)

itraconazole (such as Nizoral® or Sporanox®) or ketoconazole

erythromycin

other treatments or medications taken for ED