Somehow, we manage to forget a third ED drug, which has proven to be at least equally if not even better albeit only slightly than Viagra. Allow 24 hours to pass between doses. After you’re finished having sex, blood flow to the penis should decrease and your erection should go away. First of all, you need to remember that it will take about twenty minutes or so for Levitra to start working and before you will feel its effects. With sexual stimulation you may achieve an erection anywhere from 25 minutes up to four to five hours after taking Levitra. Swallow one tablet with a glass of water. Take a Levitra tablet about 25 to 60 minutes before sexual activity.Get Savings Anywhere. Download the MD app and use the MDRx coupons anytime, anywhere. Compare prices and find coupons that can instantly save you up to 80% on thousands of prescriptions. Viagra and Levitra may cause mild side effects in some people. The chart below lists examples of mild side effects that have been reported with these drugs. Viagra. Levitra. headache flushing.  · Drug prices vary by pharmacy. Use GoodRx to find current prices and discounts. Get free coupons. GoodRx coupons can help you pay less than the cash price for your prescription. Show to your pharmacist. It’s easy. Just bring your free coupon to the pharmacy when picking up your prescription.