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TUESDAY, April 14 (HealthDay News) -- The erectile dysfunction drugs Cialis (tadalafil) and Viagra (sildenafil) didn't appear to damage vision in men who took the medications daily for six months, according to a drug company study. Infertility is the inability to get pregnant after trying for at least 1 year without using birth control. About 15% of couples are infertile. Sildenafil is a potent inhibitor of PDE-5, the enzyme that acts in the corpora to break down cGMP. This action is mediated by the secondary neurotransmitter NO, which is primarily responsible for smooth muscle relaxation within the corpora cavernosa. The inhibition of PDE-5 slows the degradation of NO, which enhances its effect. This permits the development of an improved and sustainable erection. The inflatable devices consist of two Silastic or Bioflex cylinders inserted into the corpora cavernosa, a pump placed in the scrotum to inflate the cylinders, and a reservoir that is contained either within the cylinders or in a separate reservoir placed beneath the fascia of the lower abdomen. The inflatable prosthesis generally remains functional for 7-10 years before a replacement may be necessary. Improvements in these devices have resulted in a failure rate of less than 10%. Complications include infections in 2% of patients, erosion of the device through the urethra or skin in 2% of patients, and painful erections in 1% of patients. A newer antibiotic-coated device has further reduced the infection rate. looking for viagra without prescription? viagra no prescription online buy Viagra 150mg here 150mg viagra online without prescription The researchers found that Viagra improved heart function in the mice by preventing the breakdown of cGMP.