Administration of STAXYN with nitrates and nitric oxide donors is contraindicated. Consistent with the effects of PDE5 inhibition on the nitric

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Side effects ≥2% and more frequent with STAXYN than placebo in controlled trials"scrollbars=yes, resizable=yes, width=400, height=400,top=500, left=500"[1]
  STAXYN (n=355) Placebo (n=340)
Headache 14.4% 1.8%
Flushing 7.6% 0.6%
Nasal Congestion 3.1% 0.3%
Dyspepsia 2.8% 0%
Dizziness 2.3% 0%
Back Pain 2% 0.3%