So Extended Release Sindafil is about to hit the market hard? Reminds of me how ER Guanfacine was brought to market as and ADHD drugs. Why invent new drugs wh

So Extended Release Sindafil is about to hit the market hard? Reminds of me how ER Guanfacine was brought to market as and ADHD drugs. Why invent new drugs when you can put new wrappers on old ones?