|What are the possible side effects of
If you experience any of the following serious side effects, stop taking
doxycycline and seek emergency medical attention:
An allergic reaction (swelling of your lips, face, or tongue, difficulty
breathing); a severe headache; vision changes; confusion; liver damage
(yellowing of the skin or eyes, nausea, abdominal pain or discomfort,
unusual bleeding or bruising, severe fatigue); blood problems (fever,
fatigue, easy bruising or bleeding); or genital sores or itching.
If you experience any of the following less serious side effects,
continue to take doxycycline and talk to your doctor: nausea, vomiting,
or diarrhea; sensitivity to the sun; dark "furry"; tongue, black tongue,
or swollen tongue; or vaginal yeast infection.
Side effects other than those listed here may also occur. Talk to your
doctor about any side effect that seems unusual or that is especially
What other drugs will affect doxycycline?
Do not take the following drugs within 2 hours of taking doxycycline
because they may decrease its effectiveness: cholestyramine (Questran)
or colestipol (Colestid); bismuth subsalicylate in products such as
Pepto-Bismol; or antacids or vitamin supplements that contain calcium,
magnesium, iron, or sodium bicarbonate.
Before taking doxycycline, tell your doctor if you are taking any of the
following medicines: an anticoagulant such as warfarin (Coumadin); or
You may not be able to take doxycycline, or you may require a dosage
adjustment or special monitoring during treatment if you are taking any
of the medicines listed above.
Doxycycline may decrease the effectiveness of birth control pills. Use a
second method of birth control to prevent pregnancy while taking
Drugs other than those listed here may also interact with doxycycline.
Talk to your doctor and pharmacist before taking any prescription or