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3.Not specifiedFrequency not reported: Neck pain[Ref]Through selective regulation of cGMP, PDE5A plays an essential role in vascular smooth muscle contraction in the corpus cavernosum.31 The PDE5A inhibitors competitively inhibit the hydrolysis of cGMP, thereby leading to smooth muscle relaxation and penile erection.12,30 Since the approved use of sildenafil in 1998 and vardenafil hydrochloride (Levitra) and tadalafil (Cialis) in 2003, PDE5A inhibitors have remained the first-line therapy for ED.12,28 Adverse effects are generally mild,12 although vision-threatening ocular complications and hearing loss have been reported.28,32

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viagra ad Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Placebo CialisComuníquese con su médico o busque atención médica de emergencia si su erección es dolorosa o dura más de 4 horas. Una erección prolongada (priapismo) puede hacerle da?o al pene.

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