What is the recommended topical antibiotic for bacterial conjunctivitis?

What is the recommended topical antibiotic for bacterial conjunctivitis?

• A. Moxifloxacin 0.5% qid
• B. Azithromycin ointment qid
• C. Ciprofloxacin 0.3% bid
• D. Erythromycin ointment once daily

Answer: (A)

For bacterial conjunctivitis, you want a topical antibiotic with broad-spectrum coverage against the common eye pathogens and good tissue penetration. A fourth-generation fluoroquinolone like moxifloxacin 0.5% four times daily provides strong activity against gram-positive organisms (such as Staphylococcus and Streptococcus) and gram-negative organisms (including Haemophilus influenzae and Moraxella), with reliable ocular surface penetration and a good safety profile. This makes it a preferred first-line choice. Erythromycin ointment, while older, has narrower spectrum and less convenient dosing for modern management; ciprofloxacin offers solid gram-negative coverage but relatively less gram-positive activity; azithromycin ointment can be effective but may not cover the full spectrum as robustly as moxifloxacin. So, moxifloxacin is the best option.

For bacterial conjunctivitis, you want a topical antibiotic with broad-spectrum coverage against the common eye pathogens and good tissue penetration. A fourth-generation fluoroquinolone like moxifloxacin 0.5% four times daily provides strong activity against gram-positive organisms (such as Staphylococcus and Streptococcus) and gram-negative organisms (including Haemophilus influenzae and Moraxella), with reliable ocular surface penetration and a good safety profile. This makes it a preferred first-line choice. Erythromycin ointment, while older, has narrower spectrum and less convenient dosing for modern management; ciprofloxacin offers solid gram-negative coverage but relatively less gram-positive activity; azithromycin ointment can be effective but may not cover the full spectrum as robustly as moxifloxacin. So, moxifloxacin is the best option.