What alternatives can I use for erectile dysfunction? Do not take two doses at one time. Often, these are prescribed for chest pain called angina. This medicine works best when you take it on an empty stomach an hour before sex. Oral medicines for ED usually work well and cause few side effects. If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department. Having pulmonary arterial hypertension PAH during pregnancy may cause heart failure, stroke, or other medical problems in both mother and baby.Here are answers to some frequently asked questions about drug cost and Cialis. What’s the cost per pill of Cialis 20 mg? How does this compare with the cost of other strengths ( mg, 5 mg, GoodRx can help you save over 80% off the average retail price of the generic versions. Generic sildenafil at certain pharmacies is as low as $ with a free GoodRx discount. You can also find generic tadalafil and vardenafil for as low as $ and $ , respectively. What’s more, you can find brand-name Stendra for as low as . Cialis is a prescription-only medicine for men, aged 18 or over, experiencing symptoms of erectile dysfunction. It comes in the form of a tablet which is taken orally, and can allow you to achieve and maintain an erection hard enough for sexual activity. You’ll need to be sexually stimulated for it to work.