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The recommended dosage of Viagra is 50mg, at least one hour before sex. However, you can generally take discounted viagra anywhere between 30 minutes and four hours before sex. The effects of Viagra’s dosages last for around four hours, although this may vary depending on the user.

However, as with any pharmaceutical product under development, there are substantial risks and uncertainties in the process of development, commercialization, and regulatory review. There is no guarantee that the product will receive additional regulatory approvals. There is also no guarantee that the product will continue to be commercially successful. For further discussion of these and other risks and uncertainties, see Lilly's filings with the&nbsp