What are the generic versions of Viagra?
['The authors conducted a 12-week case series to study the efficacy and safety of Elonza (generic sildenafil) in PAH patients.']
['Generic versions of sildenafil are Elonza, Caverta, Zenegra-100, Vega Asia, Suhagra-100, Vega, Revatio.']
['Elonza', 'Caverta', 'Zenegra-100', 'Vega Asia', 'Suhagra-100', 'Vega']