Did anybody tried Naigra, a Viagra generic drug ? Thank you?

Answer:
not sure such a drug exists. the geniric is just that a generic and therefor would not have a name

read more about generics and why they cost so much less below

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I wouldn't trust the name. I'd just stick with the brand name that you'd get at the pharmacy person to person. Niagra I believe is a fake...

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There is no Naigra.
The generic name of Viagra is Sildenafil, and it is not on the market as of now.

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YEP
but the effect is not the same as the original one coz it causes headache and may be skin allergy.

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The true generic for viagra is sildenafil citrate. You can view info on the generic including prices at http://www.4rx.net

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I haven't tried such a drug, and to be honest have never even heard of such. But here is some information about generic medicines, which is might be of some interest to you.
A generic drug is called by its chemical name (which is Sildenafil for Viagra). The difference from the brand-name drug is that the second has a brand name assigned by a manufacturer. The products have the same ingredients.
Standard practice and most state laws require that a generic drug be generically equivalent to its brand-name counterpart. That is, it must have the same active ingredients, strength, and dosage form - pill, liquid, or injection. The generic drug also must be therapeutically equivalent - it must be the same chemically and have the same medical effect.

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