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Even though the instructions are to take it 30–60 minutes before sex, Viagra® lasts in the body for up to 6–8 hours. An enzyme called phosphodiesterase-5 breaks down cGMP leading the penis to return to its flaccid state. Viagra® should be taken without food minutes before sex and its effects last up to 6-8 hours. Not only does Chewy offer the bestpet supplies, but you can also order pet prescriptions and have them delivered right to your doorstep. No matter…