Doxycycline.

Doxycycline is used for the treatment of bacterial infections that can affect different organs and need to be treated fast to help your immune system take control of the situation. You may need to use an additional non-hormonal method of birth control as doxycycline has been reported to make birth control pills less efficient. Do not combine doxycycline with other medications without your doctor's consent, especially anticoagulants, carbamazepine, phenytoin, antacids, phenobarbital, or penicillin. Doxycycline has been reported to make your skin sensitive to sunlight, which means you will need to avoid direct sun exposure and wear protective clothes when you do have to stay outside for some time. Other side effects you may experience when taking doxycycline include vomiting, swollen tongue, trouble swallowing, diarrhea, vaginal itching, sores or swelling in your rectal or genital area, sore mouth, mild nausea, and stomach upset. Those are considered to be mild side effects and there is no need to report them to your health care provider. Make sure you never give doxycycline to children younger than eight, as this medicine can affect their teeth and lead to permanent yellowing or graying of the teeth later in life.