[HSF] FDA-PAH – sildenafil

[yadav del]

   Viagra [Sildenafil] is not approved by FDA for pulmonary hypertension. Revatio[sildenafil] is approved by FDA for pulmonary hypertension.
  Both Viagra and sildenafil are  from Pfizer.
   
  Are they different compounds ?  or some thing to do with  FDA approval system?

       
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