SIDE EFFECTS: Upset stomach, nausea, diarrhea, or mild headache may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these unlikely but serious side effects occur: sunburn (sun sensitivity), difficult/painful swallowing, brown/gray tooth discoloration, blue/gray/brown discoloration of the skin/lips/tongue/gums, unusual tiredness, new signs of infection (e.g., fever, chills, persistent sore throat), change in the amount of urine, pink urine.
Tell your doctor immediately if any of these rare but very serious side effects occur: hearing changes (e.g., ringing in the ears, decreased hearing), easy bruising/bleeding, unusual/severe headache, vision changes (e.g., blurred vision), severe stomach/abdominal pain, persistent nausea/vomiting, yellowing eyes/skin, dark urine.
This medication may rarely cause a severe intestinal condition (pseudomembranous colitis) due to a type of resistant bacteria. This condition may occur during treatment or weeks to months after treatment has stopped. Do not use anti-diarrhea products or narcotic pain medications if you have any of the following symptoms because these products may make them worse. Tell your doctor immediately if you develop: persistent diarrhea, abdominal or stomach pain/cramping, blood/mucus in your stool.
Use of this medication for prolonged or repeated periods may result in oral thrush or a new vaginal yeast infection (fungal infections). Contact your doctor if you notice white patches in your mouth, a change in vaginal discharge, or other new symptoms.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction: rash, skin lesions/sores, itching, swelling, severe dizziness, trouble breathing, new or worsening swelling/pain in the joints, swollen glands, chest pain, fast/irregular heartbeat.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
Contact your doctor for medical advice about side effects. The following numbers do not provide medical advice, but in the US you may report side effects to the Food and Drug Administration (FDA) at 1-800-FDA-1088. In Canada, you may call Health Canada at 1-866-234-2345.
PRECAUTIONS: Before taking doxycycline, tell your doctor or pharmacist if you are allergic to it; or to tetracycline or related drugs (e.g., minocycline); or if you have any other allergies.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease, liver disease, problems swallowing, esophagus problems (e.g., hiatal hernia, reflux disease-GERD), stomach surgery (e.g., gastrectomy, gastric bypass surgery), lupus.
This medication may make you more sensitive to the sun. Avoid prolonged sun exposure, tanning booths, and sunlamps. Use a sunscreen and wear protective clothing when outdoors.
Before having surgery, tell your doctor or dentist that you are using doxycycline.
This medication should not be used in children younger than 8 years of age because it may cause permanent tooth discoloration and other problems. Tooth discoloration has also occurred in older children and young adults. Consult your doctor for more information.
This medication is not recommended for use during pregnancy because of possible harm to an unborn baby. It should not be used in women or men trying to have a child. Women of child-bearing age and men should use effective birth control while taking this medication. Consult your doctor for more details. If you become pregnant or think you may be pregnant, inform your doctor immediately.
This medication passes into breast milk in very small amounts. While there have been no reports of harm to nursing infants, consult your doctor before breast-feeding.