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There's a range in part because doctors and researchers don't all agree on where the cutoff should be for low levels of the male sex hormone. Spitzer and his colleagues found that a starting course of sildenafil citrate, marketed as Viagra, helped improve sexual functioning for men with both conditions.

Detailed information

Sildenafil (Viagra) works by inhibiting the enzyme PDE5. This means that cGMP is not hydrolysed as fast and this allows the smooth muscle to relax.

¬ He suggests taking just one gram per day ‚ you should be especially cautious about exceeding that amount if you have a history of herpes flare-ups, since high doses of L-arginine may reactivate the virus, he warned. Testosterone replacement therapy. When your penis stops working, you may automatically assume low testosterone is to blame. But the truth is, a shortage of testosterone is the cause of erectile dysfunction only about 5 percent of the time, said McVary.

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