Continue to take tadalafil even if you feel well. Resources and support See the Healthy Male site for more information about erectile dysfunction and its treatment. The drug works by increasing blood flow to the penis, thus aiding in achieving an erection. In some cases, online ED providers accept health insurance. Cialis will be available by prescription only. Consult Your Physician Before purchasing Cialis or any medication online, always consult with your doctor.We would like to show you a description here but the site won’t allow more. Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether you have insurance, your individual plan. If you take Cialis long term, you may be able to lower your costs in the following ways: Look into getting a day supply of your medication. You may be able .