Viagra Connect comes in one dosage, 50mg. 50mg is the recommended dose for people that have not used Viagra before, as it is a sufficient strength for most people suffering from erectile dysfunction. Viagra Connect may not be effective the first time you take it, your body may need time to adjust to the treatment, so it should be tried at least 8 times to allow for Viagra Connect to reach its full effect before trying a different erectile dysfunction treatment. Viagra Connect remains effective for 4 to 6 hours after taking it.