Sildenaplex (Sildenafil citrate) also known as Viagra or Kamagra, is a drug used to treat erectile dysfunction and pulmonary arterial hypertension. Sildenaplex acts by inhibiting cGMP specific phosphodiesterase type 5, an enzyme that regulates blood flow in the penis. Its primary competitors on the market are Tadalaplex (Cialis) and vardenaplex (Levitra) both produced by Axiolabs.
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