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Pharmacologic therapy includes intracavernosal injections, intraurethral injection and oral therapies. Until recently there was only one FDA approved oral therapy, sildenafil citrate (Viagra). On August 19, 2003 the FDA approved vardenafil (Levitra). On November 21 they approved tadalafil (Cialis). All these products are available by prescription only. In additon there are several other pharmaceuticals currently being developed.