Remember that expediting will cost extra. It may be difficult to remain firm despite wanting to have sex. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. Many men want to know how to get prescription ED pills without a doctor or other medical professional. Using the ED medicines we prescribe puts you at greater risk of severe reactions such as extreme dizziness, fainting, heart attack, and stroke. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider.You should consult your health care professional before taking any drug, changing your diet, or commencing or discontinuing any course of treatment. Vardenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, vardenafil w. Levitra (vardenafil): This medication is taken one hour before sex and can last up to 24 hours. It’s available in 10 mg and 20 mg tablets. Stendra (avanafil): This is an as-needed medication taken 30 minutes before sex and can last up to six hours. It’s available in 50 mg, mg, and mg tablets. You can find generic vardenafil at many pharmacies, and it requires a prescription to buy. Some pharmacies may sell various package sizes. In general, the price per tablet gets cheaper the larger.