Which antibiotics are associated with the most significant effects on tear film breakup time and meibum quality?

• A. Oral doxycycline and topical azithromycin
• B. Oral doxycycline and topical erythromycin
• C. Oral minocycline and topical moxifloxacin
• D. Oral azithromycin and topical doxycycline

Answer: (A)

Tear film stability in meibomian gland dysfunction improves most when you address both gland inflammation and the quality of the lipid secretions. Oral doxycycline provides strong anti-inflammatory effects in the meibomian glands, including inhibition of matrix metalloproteinases and normalization of lipid processing, which tends to improve meibum quality and extend tear film breakup time. Topical azithromycin adds a potent anti-inflammatory action on the ocular surface and within the meibomian glands, further enhancing lipid layer quality and tear stability.

This combination therefore offers the strongest overall impact on both TBUT and meibum quality compared with other pairings that rely on agents with weaker anti-inflammatory effects or targeted antibacterial activity alone.