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Viagra is a drug indicated to treat erectile dysfunction .How does it work, how do I use it, and how do I get it?French law does not allow the online sale of prescription drugs. Viagra® requires a prescription and cannot be sold online in France .The essential points In most cases, Viagra begins to work about 30 minutes after taking it. Its effects begin to wear off after three to five hours. Efficacy of Viagra: Different studies have shown that the proportion of patients reporting an improvement is 84% ??in case of psychogenic erectile disorders, 77% in case of mixed erectile disorders and 68% in case of organic erectile disorders.How does Viagra work?Viagra ® facilitates the flow of blood into the penis by inhibiting an enzyme (phosphodiesterase E5, often called PDE5 ).PDE5 degrades one of the molecules (cGMP) which allows the relaxation of the smooth muscles of the penis and the blood flow necessary for erection. Inhibiting PDE5 therefore facilitates erections.Viagra® promotes erection when a man is sexually stimulated. Stimulation is still necessary because the drug alone will not cause an erection: Viagra® does not act as an aphrodisiac.How to use https://www.star-viagra.com/ ?The Viagra® tablet should be swallowed with a glass of water. It is recommended to take it approximately 1 hour before having sexual intercourse.For most men, Viagra® begins to work 30 minutes after taking it and peaks within an hour. This is why doctors recommend taking the treatment one hour before having sex.If the treatment was taken with food, its effects may be delayed for approximately one hour.