Do not take more or less of it or take it more often than prescribed by your doctor. Persons surnamed “Cialis” objected to Eli Lilly and Company’s so naming the drug, but the company has maintained that the drug’s trade name is unrelated to the surname. Your doctor will probably tell you not to take tadalafil if you are taking nitrates. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar. You should also call your insurance company to see if they cover erectile dysfunction medications. Most companies have an FAQ or shipping policy page you can reference to learn whether discreet packaging is available.Tadalafil – STADA T20 – 20 Milligramm. Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. [4] [5] [7] It is taken by mouth. [7] Onset is typically within half an hour and the duration is up to 36 hours. Generic name: tadalafil [ ta-DAL-a-fil ] Brand names: Adcirca, Do not take Cialis for erectile dysfunction if you are taking Adcirca for pulmonary arterial hypertension. including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.