Privacy: Confirm that your personal data and payment details are confidential. If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department. Remember, when in doubt, always consult with a healthcare professional. Insurance: If you plan to use insurance, make sure the online provider accepts it. The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire.Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men. Tadalafil (Generic for Cialis) Tablets · 20mg · 6-day supply. With insurance. est. $ Estimated insurance price. Final price varies with your insurance. Without insurance. . Taking two 5-milligram (mg) tablets of Cialis is the same as taking one mg tablet. If your doctor prescribes 10 mg of Cialis, you can take two 5-mg tablets to reach this dose. However, it’s important that you only take the dosage of Cialis your doctor prescribes. If they haven’t prescribed 10 mg of Cialis, it’s best not to take two 5.