With Viagra, the effects last approximately 4 hours. Cialis works a bit faster (within about 15 minutes), and the effects last much longer -- up to 36 hours in some cases. Stendra can start working in as little as 15 minutes and last up to 6 hours.here are only five oral drugs approved by the FDA to treat erectile dysfunction: tadalafil (Cialis), vardenafil (Levitra, Staxyn), avanafil (Stendra), and sildenafil (Viagra). All work by increasing the flow of blood into the penis so that when a man is sexually stimulated, he can get an erection.
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