A Phytochemical Specific Formula. Because everyone is unique, we designed Napreva for flexibility. That means you can find the right amount for you! Assess your discomfort on a 1-10 scale. Follow with 4 sprays under your tongue. Wait 60 seconds, swallow. After 10-12 minutes reassess your level of discomfort, then repeat as needed. With reduced discomfort, use 2-3 times/day. To aid sleep, use 3-5 sprays under you tongue 30 minutes prior to bed.