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Sildenafil, sold under the brand name Viagra, among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [ 4][ 8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [ 9]
Research shows that, when used properly, these ED pills can help improve function. Many of these pills work fairly quickly. Sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra ...
Cialis and Viagra, as well as their generic equivalents, belong to a class of drugs referred to as PDE5 inhibitors. These medications work by inhibiting the actions of an internal enzyme called ...
Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. [ 5][ 6][ 8] It is taken by mouth. [ 8] Onset is typically within half an hour and the duration is up to 36 hours.
Erectile dysfunction. Erectile dysfunction ( ED ), also referred to as impotence, is a form of sexual dysfunction in males characterized by the persistent or recurring inability to achieve or maintain a penile erection with sufficient rigidity and duration for satisfactory sexual activity. It is the most common sexual problem in males and can ...
Vardenafil's indications and contraindications are the same as with other PDE5 inhibitors; it is closely related in function to sildenafil citrate (Viagra) and tadalafil (Cialis). The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ...