The biggest concern of using Cialis and Viagra or Levitra has been that of NAION. From 2000 to 2004, the FDA (Food and Drug Administration) received 50 reports of vision loss linked to the use of Viagra and 5 cases with the other two ED drugs Cialis and Levitra.



The difference is understandable, since Viagra has been in the market for more than 6 years, while Cialis and Levitra have been in the market since 2003.

Neither the FDA nor any manufacturer has ever acknowledged loss of vision and blindness as a potential side effect. This medical condition is called non arterictic anterior ischemic optic neuropathy (NAION).

This condition restricts blood flow to the eyes and compresses the optic nerve, which can lead to rapid loss of vision.

The first case of vision loss was reported in 2000. FDA is aware of the reports but has not determined the cause and is still studying any correlation between Viagra or Cialis use and loss of vision as a side effect.

The consumer advocacy group Public Citizen Health Research Group has criticized the FDA for not taking stronger action and has called for a Viagra, Cialis & Levitra black box warning for NAION. Public Citizen's own review of research indicates that men taking Viagra are 18 time more likely to develop NAION than other men with similar risk factors, and that men taking Cialis are 25 times more likely to develop NAION.

If you are taking an ED drug like Cialis and Viagra and notice changes in your vision, you should stop taking the drug and see your healthcare provider immediately. You should also get immediate help if you notice any problems with your heart or blood pressure.

The other side effects of taking Cialis are headache, indigestion, back pain, dizziness, nausea, muscle aches, flushing, stuffy or running nose, an allergic reaction (difficulty breathing, closing of the throat, swelling of the lips, tongue, or face, or hives).

Other serious side effects of Cialis are chest pain or irregular heartbeats, or angina (pain, tightness, discomfort, numbness, or tingling in the chest, arms, neck, or jaw), swelling of the ankles or legs, shortness of breath, prolonged or severe dizziness, or a prolonged (lasting longer than 4 hours) or painful erection during sexual intercourse, or temporary blue tint in vision or difficulty telling the difference between the colors blue and green (uncommon). Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual.

Men should not drink alcohol in excess with Cialis. Excessive alcohol may increase the risk of headache, dizziness, increased heart rate, or low blood pressure.

Grapefruit and grapefruit juice may also interact with Cialis (Tadalafil). The interaction could lead to potentially adverse effects. You should discuss the use of grapefruit and grapefruit juice with your doctor. Do not increase or decrease the amount of grapefruit products in your diet without first talking to your doctor.

Viagra and Cialis should not be taken without doctors prescription It is easy to buy Cialis or Viagra through any certified internet pharmacy. No purchase should be done without a proper prescription.