Some other drugs can interact with doxycycline and cause you problems.
People taking the common blood-thinning medicine called Warf (warfarin) may be at an increased risk for bleeding if they take doxycycline. If there are no alternatives, the warfarin dose can be adjusted allowing you to take both medicines safely.
Certain antacids (containing calcium or magnesium) should also be avoided while taking doxycycline.
The most common side effects of doxycycline are sun sensitivity (a person can get a sunburn more easily than normal). To prevent sunburn, avoid midday sun, and wear a high SPF sunblock. Doxycycline may also cause nausea and stomach pain. These side effects can often be lessened by taking doxycycline with food. Women who use doxycycline may develop a vaginal yeast infection. You can either take an over the counter or prescription medication if vaginal itching or discharge develops. All medicines may have some side effects. Minor side effects such as nausea, occasional vomiting, or diarrhoea usually do not require stopping the drug.
Doxycycline can be prescribed to adults and children who are at least 8 years old.
It should not be used by pregnant women. It should not be given to children under the age of 8 years.