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The drug label is different from pharmacy-generated drug information, which is of varying quality. Check for drug label changes periodically for any drug taken long term. Last year, the FDA issued this alert that resulted in a label change for all three erectile dysfunction drugs: "A small number of men have lost eyesight in one eye some time after taking Viagra, Cialis, or Levitra. This type of vision loss is called non-arteritic anterior ischemic optic neuropathy (NAION). NAION causes a sudden loss of eyesight because blood flow is blocked to the optic nerve." COPYRIGHT 2006 Center for Medical Consumers, Inc. COPYRIGHT 2008 Gale, Cengage Learning. lowest cost viagra viagra experence very cheap viagra buy viagra for cheap
