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Sildenafil is the chemical name for Viagra. It is a drug used to treat erectile dysfunction (impotence) and pulmonary arterial hypertension (PAH).
SNPs in at least 2 genes are associated with poor response to sildenafil; these include:
- In the ACE gene: the 4 representing the Alu insertion/deletion polymorphism (rs1799752, rs4340, rs13447447, rs4646994)