Sildenafil Citrate Tablets 50mg ,Manufactured by akums drugs & pharmaceuticals ltd ,INDIA?

Sildenafil Citrate Tablets 50mg ,Manufactured by akums drugs & pharmaceuticals ltd ,INDIA
works exactly the same as brand name viagra ?
why the brand name drug costs a lot more than the generic viagra?
akums drugs & pharmaceuticals ltd ,INDIA is a trusted source?
It's an India drugs company.
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