Cialis is most often prescribed to men with erectile dysfunction (ED) and is taken prior to expected sexual activity. Generic Cialis, called Tadalafil, is also available at some online pharmacies. You will need a valid prescription from your doctor to buy Cialis or Tadalafil generic.
Sildenafil - Wikipedia Sildenafil Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension.   It is unclear if it is effective for treating sexual dysfunction in women.  It is taken by mouth or by injection into a vein. 
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Tadalafil - STADA T20 - 20 Milligramm Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction (ED), benign prostatic hyperplasia (BPH), and pulmonary arterial hypertension.  It is a tablet taken by mouth.  Onset is typically within half an hour and the duration is up to 36 hours.