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There are only three FDA approved drugs available for treating erectile dysfunction, Viagra Cialis, or Levitra. All three are designed to get the blood flowing into the penis so that once a man gets sexually stimulated he can obtain and keep an erection. They all work in the same manner to produce an erection but what does vary is the amount of time that they work for and how quickly they work. To many people this is an important factor to be considered. Comparing Levitra to Viagra, both begin working in about a half an hour but Levitra lasts for about five hours and Viagra lasts for about four hours. Cialis takes effect in as little as fifteen minutes and lasts for up to 36 hours. cialis cheap mg viagra regimen prior to ivf generic viagra zenegra cialis levitra how to get viagra hmo viagra give you a
