Which is a disadvantage of compound-centered drug design?

• A. Takes significant effort to isolate, without guarantee of success.
• B. It always yields immediate results.
• C. Isolation from natural sources is easy.
• D. It eliminates the need for synthetic chemistry.

Answer: (A)

In compound-centered drug design, the search starts by isolating individual bioactive compounds from complex mixtures or from libraries, then characterizing and optimizing them. The major drawback is that isolating the true active compound is labor-intensive and uncertain—you can spend a lot of time sifting through fractions, and there’s no guarantee you’ll find a useful lead. Even when you do identify an active molecule, the amount recovered can be tiny, making scale-up and further development costly and slow. This fundamental inefficiency is what makes this approach a disadvantage.

The idea that results come quickly is not accurate, and claiming isolation from natural sources is easy isn’t true. Likewise, assuming synthetic chemistry isn’t needed ignores the reality that even after isolation you typically need substantial medicinal chemistry to improve potency, selectivity, and pharmacokinetic properties.