Individuals who do not respond to Viagra have other options including cialis or levitra. Both cialis and levitra appear to work much better in men who do not respond to Viagra. All three medications work in the same way. These pills enhance the effects of nitric oxide and relax muscles in the penis. This results in increased blood flow, which causes an erection when the penis is stimulated.
The dose and the duration of action of these medications vary. Unlike Viagra, erections with levitra are said to last more than 8-12 hours- of course you need some type of sexual stimulation for this. Spontaneous erections do not occur with any of these medications.
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