Dr Frank replied: "1)If taken on an empty stomach Viagra is active in about 30 minutes. Levitra, a related dug is less affected by food.
2) There is little evidence that any of the 'natural' alternatives are much use.
3) The half life of Viagra is about 3 hours, but the erection doesn't last that long! Once sex and orgasm has occurred that's about it. Cialis again a similar drug is said to have an effect on erection for up to 48 hours, unfortunately it also has prolonged side effects.
None of the 3 drugs spontaneously produce erection they just facilitate it in those who would otherwise find it difficult. Sexual stimulation is also required for an erection to occur."
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