Doxycycline is a tetracycline antibiotic that inhibits bacterial growth and is
thought to have anti-inflammatory effects. Doxycycline is used to treat many
different bacterial infections including acne, urinary and respiratory tract
infections, eye infections, gum disease, gonorrhea, chlamydia, and syphilis.
It can also be used prevent malaria and treat infections caused by mites,
ticks, or lice.





Get emergency medical help if you have any **signs of an allergic reaction to
doxycycline:** (hives, difficult breathing, swelling in your face or throat)
**or a severe skin reaction** (fever, sore throat, burning in your eyes, skin
pain, red or purple skin rash that spreads and causes blistering and peeling).

**Seek medical treatment if you have a serious drug reaction that can affect
many parts of your body.** Symptoms may include: skin rash, fever, swollen
glands, flu-like symptoms, muscle aches, severe weakness, unusual bruising, or
yellowing of your skin or eyes. This reaction may occur several weeks after
you began using doxycycline.

**Doxycycline may cause serious side effects. Call your doctor at once if you
have:**

  * severe stomach pain, diarrhea that is watery or bloody;

  * throat irritation, trouble swallowing;

  * chest pain, irregular heart rhythm, feeling short of breath;

  * little or no urination;

  * **low white blood cell counts** \- fever, chills, swollen glands, body aches, weakness, pale skin, easy bruising or bleeding;

  * severe headaches, ringing in your ears, dizziness, nausea, vision problems, pain behind your eyes;

  * loss of appetite, upper stomach pain (that may spread to your back), tiredness, nausea or vomiting, fast heart rate, dark urine, jaundice (yellowing of the skin or eyes).

**Common side effects of doxycycline may include:**

  * nausea and vomiting;
  * upset stomach;
  * loss of appetite;
  * mild diarrhea;
  * skin rash or itching;
  * darkened skin color;
  * vaginal itching or discharge.

This is not a complete list of side effects and others may occur. Call your
doctor for medical advice about side effects. You may report side effects to
FDA at 1-800-FDA-1088.

Doxycycline side effects (more detail)