Hello,
Thank you for posting your question to HCM
This is Dr. Papaqako answering your question.
This is one of the side effects of Doxycycline,
hypersensitivity of the skin from sun exposure, which may lead to sunburn.
Other important side effects are,
Severe headache, Blurry vision, Rash or hives, Trouble breathing or swallowing, Yellowing of the skin or eyes, Dark-colored urine, Light-colored bowel movements, Loss of appetite, Nausea or
vomiting, Stomach pain, Extreme
tiredness or weakness, Confusion, Less
frequent urination.
If any of these happen, you should call immediately your doctor so he changes the medicine to another one that you tolerate better.
Hope this helps.
If anything unclear, please feel free to ask.
Regards.