Which medications in the drug class Phosphodiesterase Type 5 Inhibitors are used in the treatment of Premature Ejaculation?

Updated: Jan 15, 2019
  • Author: Samuel G Deem, DO; Chief Editor: Edward David Kim, MD, FACS  more...
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Answer

Phosphodiesterase Type 5 Inhibitors

In some studies, sildenafil and other phosphodiesterase type 5 (PDE5) inhibitors in combination with SSRIs has yield better results in treating premature ejaculation than SSRIs alone. The mechanism of this effect is unknown. Regardless of the mechanism, PDE5 inhibitors are safe and effective treatment adjuncts for premature ejaculation if not otherwise contraindicated. The only PDE5 inhibitors studied to any degree in this setting are sildenafil and tadalafil; vardenafil may also work, but more data are needed.

Sildenafil (Viagra)

Sildenafil is FDA-approved for the treatment of erectile dysfunction but not specifically for the treatment of premature ejaculation. If both conditions are present, sildenafil may help them both. Sildenafil in combination with an SSRI-type drug alleviates premature ejaculation better than an SSRI-type drug alone, as measured by prolongation of intravaginal ejaculatory latency time (IELT). More drug-related adverse events may occur because 2 medications are being used rather than just 1.

Tadalafil (Cialis)

Tadalafil is FDA-approved for the treatment of erectile dysfunction but not specifically for the treatment of premature ejaculation. Studies suggest that it may improve both conditions concurrently. Tadalafil in combination with an SSRI-type drug alleviates premature ejaculation better than an SSRI-type drug alone, as measured by prolongation of IELT. More drug-related adverse events may occur because 2 medications are being used rather than just 1.

Inhibition of PDE5 increases cyclic guanosine monophosphate (cGMP) activity, which increases the vasodilatory effects of nitric oxide. Sexual stimulation is necessary to activate response. Increased sensitivity for erections may last 36 hours with intermittent dosing. For more frequent sexual activity (eg, twice weekly), a daily low-dose regimen may be recommended; men can attempt sexual activity at any time between daily doses. Tadalafil is available as 2.5-mg, 5-mg, 10-mg, and 20-mg tablets.


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