Demeclocycline is a tetracycline antibiotic that is used to treat many different bacterial infections, such as urinary tract infections, lung infections, intestinal infections, acne, gonorrhea, chlamydia, Rocky Mountain spotted fever, and others.

Demeclocycline may also be used for purposes not listed in this medication guide.

You should not use this medicine if you are allergic to demeclocycline or similar antibiotics such as doxycycline, minocycline, or tetracycline.

Tell your doctor if you have ever had:

• liver or kidney disease;
• diabetes; or
• lupus.

If you are using demeclocycline to treat gonorrhea, your doctor may test you to make sure you do not also have syphilis, another sexually transmitted disease.

Do not use if you are pregnant. Taking demeclocycline during the second or third trimester of pregnancy may cause bone growth problems in the unborn baby, or permanent tooth discoloration later in life.

Demeclocycline can make birth control pills less effective. Ask your doctor about other birth control options such as an injection, implant, skin patch, vaginal ring, condom, diaphragm, cervical cap, or contraceptive sponge.

Demeclocycline can pass into breast milk and may affect bone and tooth development in a nursing infant. Do not breastfeed while you are taking doxycycline.

Children younger than 8 years old should use demeclocycline only for infections that cannot be treated with a safer antibiotic. Demeclocycline can affect a child's growth or cause permanent yellowing or graying of the teeth.

Use Declomycin (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction (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).

Call your doctor at once if you have:

• severe stomach pain, diarrhea that is watery or bloody (even if it occurs months after your last dose);
• new or worsening cough, fever, trouble breathing;
• painful swallowing, vomiting blood (avoid lying down right after taking demeclocycline);
• kidney problems--swelling, urinating less, feeling tired or short of breath;
• low blood cell counts--fever, chills, tiredness, confusion or weakness, mouth sores, skin sores, easy bruising, unusual bleeding, pale skin, cold hands and feet, feeling light-headed or short of breath;
• increased pressure inside the skull--severe headaches, ringing in your ears, dizziness, nausea, vision problems, pain behind your eyes; or
• signs of liver or pancreas problems--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 may include:

• nausea, vomiting, diarrhea, loss of appetite;
• darkened skin color;
• swollen tongue, trouble swallowing; or
• 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.

Avoid taking anti-diarrhea medicine without first asking your doctor. Diarrhea may be a sign of a new infection.

Demeclocycline could make you sunburn more easily. Avoid sunlight or tanning beds. Wear protective clothing and use sunscreen (SPF 30 or higher) when you are outdoors.

Avoid taking iron supplements, multivitamins, calcium supplements, antacids, or laxatives.

Do not take with milk or other dairy products unless your doctor tells you to.