Generic Name: Doxycycline

  • What is Doryx?

    Doryx is an antibiotic used to treat a wide variety of bacterial infections, including Rocky Mountain spotted fever and other fevers caused by ticks, fleas, and lice, some sexually transmitted infections, respiratory tract infections, eye infections, and infections where penicillin cannot be used. Doryx may also be used to treat other conditions, as determined by your doctor.

  • What is the most important information I should know about Doryx?

    Like all antibiotics, Doryx works only against bacteria. It will not cure an infection caused by a virus, such as the common cold or flu.

    Generally, children <8 years old and women in the last half of pregnancy should not take Doryx because it may cause developing teeth to become permanently discolored. Doryx can also impair the bone growth of a baby.

    Mild diarrhea is common with antibiotic use. However, a more serious form of diarrhea, although rare, may occur. Contact your doctor right away if you experience stomach pain or cramps, severe diarrhea, or bloody stools. Do not treat the diarrhea without first checking with your doctor.

    Doryx may make your skin more sensitive to light. If you notice a sunburn or rash developing, stop taking Doryx and call your doctor immediately.

    Birth control pills may not be as effective while you are taking Doryx. Ask your doctor or pharmacist if you should use another form of birth control while taking Doryx.

  • Who should not take Doryx?

    Do not take Doryx if you have had an allergic reaction to Doryx or any other similar antibiotics.

  • What should I tell my doctor before I take the first dose of Doryx?

    Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Doryx. Also, talk to your doctor about your complete medical history.

  • What is the usual dosage?

    The information below is based on the dosage guidelines your doctor uses. Depending on your condition and medical history, your doctor may prescribe a different regimen. Do not change the dosage or stop taking your medication without your doctor's approval.

    Adults: The usual dose is 200 milligrams (mg) on the first day of treatment (taken as 100 mg every 12 hours) followed by a maintenance dose of 100 mg per day. The maintenance dose may be taken as a single dose or as 50 mg every 12 hours. Your doctor may prescribe 100 mg every 12 hours for more severe infections such as a chronic urinary tract infection.

    Children >8 years (≤100 pounds): Your doctor will prescribe the appropriate dose for your child based on their body weight.

    Children >8 years (>100 pounds): The usual adult dose should be used.

  • How should I take Doryx?

    Take Doryx with a full glass of water to avoid irritating your throat or stomach. Doryx can be taken with or without food. However, if the medicine does upset your stomach, take it with a glass of milk or after you have eaten.

    Doryx tablets should be swallowed whole. However, if you have difficulty swallowing tablets, you can take Doryx by carefully breaking up the tablet and sprinkling the entire contents onto a spoonful of cool, soft applesauce. Swallow the mixture immediately, without chewing, followed by a glass of water. Discard the mixture if you are not able to use it immediately; do not store it to use later.

    It is important to take the full dosage schedule of Doryx, even if you are feeling better in a few days. Not completing the full dosage schedule may decrease the drug's effectiveness and increase the chances that the bacteria may become resistant to Doryx and similar antibiotics. If this happens, Doryx and similar antibiotics may not work in the future.

  • What should I avoid while taking Doryx?

    You may become more sensitive to UV light while taking Doryx. Avoid sunlamps, tanning beds, and limit your time in the sun. If you develop a skin rash or sunburn, stop taking Doryx and call your doctor immediately.

    Avoid taking Doryx with antacids, bismuth subsalicylate, and iron products.

  • What are possible food and drug interactions associated with Doryx?

    If Doryx is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Doryx with the following: antacids containing aluminum, calcium, or magnesium, barbiturates such as phenobarbital, birth control pills, bismuth subsalicylate, blood-thinning medications such as warfarin, carbamazepine, iron-containing products, penicillin, and phenytoin.

  • What are the possible side effects of Doryx?

    Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.

    Side effects may include: diarrhea, nausea, vomiting, skin rash, swelling, hives, difficulty breathing, light sensitivity, blood disorders, difficulty swallowing, headache, vaginal yeast infections, loss of appetite, rectal or genital itching

  • Can I receive Doryx if I am pregnant or breastfeeding?

    Doryx should not be used during pregnancy. Doryx can damage developing teeth during the last half of pregnancy. Doryx also appears in breast milk and can affect a breastfeeding infant. Tell your doctor immediately if you are pregnant, plan to become pregnant, or are breastfeeding.

  • What should I do if I miss a dose of Doryx?

    If you miss a dose of Doryx, take the missed dose as soon as you remember it. However, if it is almost time for your next dose, skip the one you missed and return to your regular dosing schedule. Do not take two doses at once.

  • How should I store Doryx?

    Store Doryx at room temperature in a well-closed container away from light.

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