The drug companies have a solution to patent limits called "evergreening" where once a patent is about to expire they make a very slight modification to the for

The drug companies have a solution to patent limits called "evergreening" where once a patent is about to expire they make a very slight modification to the formula, pump massive amounts of cash into marketing it as "new and better" even when there are little to no benefits over the old formula. Doctors are easily bribed or mislead into prescribing the expensive new formula over generics and drug companies can continue to make large profits on old drugs instead of innovating.