Doxycycline may cause esophagitis and diarrhea in elderly patients. To manage, take with plenty of water and after meals. It can exacerbate kidney issues, so monitor renal function.

Elderly may face increased risks of tendonitis and tendon rupture with doxycycline. They should avoid strenuous activities and report joint pain. Regular renal function tests are advised.

Doxycycline can lead to gastrointestinal upset and photosensitivity in the elderly. Ensure hydration, avoid direct sunlight, and monitor kidney function due to potential impairment.