Doxycycline.

Doxycycline is a prescription drug specially intended for patients diagnosed with any of the wide range of infections caused by bacteria. It works by slowing down the activity of the bacteria. You may need to be taking this medicine if you have been diagnosed with a bacterial infection and your immune system does not seem to be able to fight it off. Taking doxycycline is associated with a number of side effects – both mild and serious. Mild side effects include trouble swallowing, sores or swelling in your rectal or genital area, stomach upset, swollen tongue, mild nausea, vaginal itching, sore mouth, vomiting, and diarrhea. There is no need to report them unless they get bothersome. More serious side effects are also possible and may include the following symptoms that you will need to report to your health care provider as soon as possible: redness of the skin, vomiting, skin rash, blurred vision, decreased urination, itching, stomach pain, upset stomach, difficulty breathing, loss of appetite, dark-colored urine, severe headache, yellowing of the skin or eyes, and confusion. Make sure you take doxycycline for as long as recommended by your doctor.