If you are taking tadalafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Because patients with recent heart attacks or stroke, heart pains angina , heart failure, uncontrolled blood pressure or uncontrolled irregular heart beats, severe liver disease, and retinal eye problems were not studied with Cialis, Cialis is not recommended for these patients. Follow your doctor’s directions carefully, and ask your doctor or pharmacist to explain any part you do not understand. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; any condition that affects the shape of the penis; diabetes; high cholesterol; high or low blood pressure; irregular heartbeat; a heart attack or heart failure; angina chest pain ; a stroke; ulcers in the stomach; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; or heart, kidney, or liver disease. CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with any nitrate medication. It may be taken with or without food. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation.Cialis (branded Tadalafil) is an erectile dysfunction treatment that lasts up to 36 hours. It is important that you let us know which prescription, over-the-counter medicines and recreational drugs you are taking so that we can prescribe Cialis safely. This service operates in the United Kingdom only. Continue with UK Service. Close. Get the facts on cost and Cialis, how the generic compares with the brand-name version, what financial assistance may be available, and more. Cialis is a prescription-only medication used to. The only common side effect caused by Stendra — but not Viagra — is a sore throat. Similarities Cialis, Levitra, or Stendra prescription. If you have health insurance, keep in mind that.