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Microbiology, 2021

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578 14 • Antimicrobial Drugs<br />

Figure 14.12<br />

Sulfonamides and trimethoprim are examples of antimetabolites that interfere in the bacterial synthesis of folic acid by<br />

blocking purine and pyrimidine biosynthesis, thus inhibiting bacterial growth.<br />

Antimetabolite Drugs<br />

Metabolic<br />

Pathway<br />

Target<br />

Mechanism of Action Drug Class Specific Drugs Spectrum of Activity<br />

Folic acid<br />

synthesis<br />

Inhibits the enzyme<br />

involved in production of<br />

dihydrofolic acid<br />

Inhibits the enzyme<br />

involved in the<br />

production of<br />

tetrahydrofolic acid<br />

Sulfonamides Sulfamethoxazole Broad spectrum against<br />

gram-positive and gramnegative<br />

Sulfones Dapsone<br />

bacteria<br />

Not<br />

applicable<br />

Trimethoprim<br />

Broad spectrum against<br />

gram-positive and gramnegative<br />

bacteria<br />

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