When you make the appointment, be sure to ask if there’s anything you need to do in advance. However, others work on a cash-pay basis and don’t partner with insurance companies. It may be difficult to remain firm despite wanting to have sex. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. This increase in blood flow results in a firmer, longer-lasting erection. It comes in doses ranging from 5 mg up to 20, as well as more easy-to-hide tablets that disintegrate under the tongue. If you are a Mayo Clinic patient, this could include protected health information.Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision . 25 milligrams (mg) 50 mg mg Typical dosages The following information describes commonly recommended dosages for ED. However, be sure to take the dosage your . Viagra takes around 30 minutes to become effective and lasts about 4 hours. Cialis lasts much longer — up to 36 hours in some cases. Stendra can start doing its thing in as little .