1. Doxycycline can be used in patients with tendon disorders, but with caution. Patients should avoid strenuous activity and excessive sun exposure during treatment.

2. Patients with a history of tendon problems should use doxycycline cautiously, ensuring to monitor for any signs of tendon pain or swelling and avoiding physical overexertion.

3. While doxycycline is generally safe, those with tendon disorders should be cautious. It’s advised to limit physical activity and sun exposure, and to stay hydrated during treatment.