Insurance Coverage: Many major insurance plans no longer cover doxycycline 40 mg capsules starting in 2016. Learn More
What should I watch for?
Tell your doctor or health care professional if your symptoms do not improve.
Do not take this medicine just before going to bed. It may not dissolve properly when you lay down and can cause pain in your throat. Drink plenty of fluids while taking this medicine to also help reduce irritation in your throat.
This medicine can make you more sensitive to the sun. Keep out of the sun. If you cannot avoid being in the sun, wear protective clothing and use sunscreen. Do not use sun lamps or tanning beds/booths.
If you are being treated for a sexually transmitted infection, avoid sexual contact until you have finished your treatment. Your sexual partner may also need treatment.
Avoid antacids, aluminum, calcium, magnesium, and iron products for 4 hours before and 2 hours after taking a dose of this medicine.
If you are using this medicine to prevent malaria, you should still protect yourself from contact with mosquitos. Stay in screened-in areas, use mosquito nets, keep your body covered, and use an insect repellent.
Common and Rare Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Incidence not known
diarrhea, watery and severe, which may also be bloody
difficulty with swallowing
feeling of discomfort
inflammation of the joints
joint or muscle pain
large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
loss of appetite
numbness or tingling of the face, hands, or feet
pain in the stomach, side, or abdomen, possibly radiating to the back
redness and soreness of the eyes
redness of the skin
sores in the mouth
stomach pain or tenderness
swelling of the feet or lower legs
swollen lymph glands
tightness in the chest
unusual tiredness or weakness
unusual weight loss
yellow eyes or skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Incidence not known
Back, leg, or stomach pains
black, tarry stools
blood in the urine or stools
bulging soft spot on the head of an infant
change in the ability to see colors, especially blue or yellow
chest pain, discomfort, or burning
cracks in the skin
decrease in vision
discoloration of the thyroid glands
general body swelling
increased sensitivity of the skin to sunlight
loss of heat from the body
lower back or side pain
pain or burning in the throat
pain with swallowing
painful or difficult urination
pinpoint red spots on the skin
rash with flat lesions or small raised lesions on the skin
red, swollen skin
redness or other discoloration of the skin
redness, swelling, or soreness of the tongue
severe stomach pain
sores, ulcers, or white spots on the lips or tongue or inside the mouth
unusual bleeding or bruising
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.