Which antibiotic is commonly used to treat chlamydia?

Which antibiotic is commonly used to treat chlamydia?

• A. Azithromycin
• B. Ceftriaxone
• C. Metronidazole
• D. Acyclovir

Answer: (A)

Chlamydia is caused by an intracellular bacterium, so the antibiotic chosen needs strong intracellular activity. Azithromycin fits this well: it’s a macrolide that inhibits bacterial protein synthesis and penetrates cells where Chlamydia trachomatis hides, making it effective against the infection. Its practical advantage is a convenient single-dose regimen, which helps with adherence and is commonly used in treating chlamydial infections. Ceftriaxone is mainly used for gonorrhea and may be used if coinfection is suspected, but it does not reliably eradicate chlamydia when used alone. Metronidazole targets anaerobes and certain protozoa, not Chlamydia. Acyclovir is an antiviral for herpesviruses, not bacteria.

Chlamydia is caused by an intracellular bacterium, so the antibiotic chosen needs strong intracellular activity. Azithromycin fits this well: it’s a macrolide that inhibits bacterial protein synthesis and penetrates cells where Chlamydia trachomatis hides, making it effective against the infection. Its practical advantage is a convenient single-dose regimen, which helps with adherence and is commonly used in treating chlamydial infections.

Ceftriaxone is mainly used for gonorrhea and may be used if coinfection is suspected, but it does not reliably eradicate chlamydia when used alone. Metronidazole targets anaerobes and certain protozoa, not Chlamydia. Acyclovir is an antiviral for herpesviruses, not bacteria.