The main reason generics are cheaper is that they don't have the underlying R&D costs and are a later stage in drug development when the mix has gone to mass production. The big pharmas will usually claim the cost of their branded products is related to the fact they invested in producing them.
Usually drugs are picked up by other manufacturers as the patents end. At that point the manufacturer keeps the brand name but the 'recipe' is up for grabs.
The drugs you see being produced to work faster are formulated differently to be faster absorbing etc and the pharmas will then get a patent on that formula. Either that or as mentioned above they are styled into different delivery mechanisms, some of which are more expensive to engineer to have a premium price.
In general terms unless they have been produced to be faster absorbing etc the degree of absorption will be the same for generics as it is for branded drugs.
Usually drugs are picked up by other manufacturers as the patents end. At that point the manufacturer keeps the brand name but the 'recipe' is up for grabs.
The drugs you see being produced to work faster are formulated differently to be faster absorbing etc and the pharmas will then get a patent on that formula. Either that or as mentioned above they are styled into different delivery mechanisms, some of which are more expensive to engineer to have a premium price.
In general terms unless they have been produced to be faster absorbing etc the degree of absorption will be the same for generics as it is for branded drugs.