The term "broad-spectrum" is often used in the context of medicines, pesticides, and other similar products. It refers to the ability of a product to work against a wide range of organisms or diseases. Therefore, antonyms for broad-spectrum would be targeted, specific, or narrow-spectrum. Such products are designed to work against a particular subset of diseases or organisms, which makes them useful in certain contexts. For instance, targeted antibiotics help fight against specific bacterial strains, while narrow-spectrum pesticides are suitable for dealing with pests in specific crops without harming beneficial insects. Although not as versatile as broad-spectrum products, targeted and specific products are essential tools in the medical and agricultural fields.