The major reason why there are fewer antiprotozoan drugs than antibacterial drugs is because

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Unlike bacterial cells, which are prokaryotic, protozoan cells are eukaryotic, meaning that they contain many of the same structures and processes as human cells. This makes it much more difficult to develop drugs that selectively target protozoan cells without harming human cells. This inherent difficulty in developing selective drugs for protozoan parasites is the major reason why there are fewer antiprotozoan drugs than antibacterial drugs. It is not because antiprotozoan drugs are not needed, cost more to develop, or are only effective when injected.

The Major Reason Why There Are Fewer Antiprotozoan Drugs Than