Viagra is the brand name for the drug sildenafil, Cialis is the brand name for tadalafil, Levitra is the brand name for vardenafil, and Stendra is. Cialis and Viagra are both PDE5 inhibitors used for the treatment of erectile dysfunction (ED). Both only work when a man is sexually aroused. Effectiveness of sildenafil citrate (Viagra) and tadalafil (Cialis) on sexual responses in Saudi men with erectile dysfunction in routine clinical practice. Ali ST(1).
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