Ezekiel J. Emanuel writes:
The big problem is profitability. Unlike drugs for cholesterol or high blood pressure, or insulin for diabetes, which are taken every day for life, antibiotics tend to be given for a short time, a week or at most a few months. So profits have to be made on brief usage. Furthermore, any new antibiotics that might be developed to fight these drug-resistant bacteria are likely to be used very sparingly under highly controlled circumstances, to slow the development of resistant bacteria and extend their usefulness. This also limits the amount that can be sold.