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Doryx
Doryx
Generic name: Doxycycline hyclate
Brand names: Vibra-Tabs, Vibramycin, Doryx
Why Doryx is prescribed
Doxycycline is a broad-spectrum tetracycline antibiotic used against a wide variety of bacterial infections, including Rocky Mountain spotted fever and other fevers caused by ticks, fleas, and lice; urinary tract infections; trachoma (chronic infections of the eye); and some gonococcal infections in adults. It is an approved treatment for inhalational anthrax. It is also used with other medications to treat severe acne and amoebic dysentery (diarrhea caused by severe parasitic infection of the intestines).
Doxycycline may also be taken for the prevention of malaria on foreign trips of less than 4 months' duration.
Occasionally doctors prescribe doxycycline to treat early Lyme disease and to prevent "traveler's diarrhea." These are not yet officially approved uses for Doryx.
The most important facts about Doryx
Generally, children under 8 years old and women in the last half of pregnancy should not take Doryx. It may cause developing teeth to become permanently discolored. (However, children under 8 may be given Doryx for inhalational anthrax.)
How you should take Doryx
Take doxycycline with a full glass of water or other liquid to avoid irritating your throat or stomach. Doxycycline can be taken with or without food. However, if the medicine does upset your stomach, you may wish to take it with a glass of milk or after you have eaten.
Doxycycline tablets should be swallowed whole. If you have difficulty swallowing pills, you can take Doryx by opening the capsule and sprinkling the entire contents onto a spoonful of cool, soft applesauce. Be careful not to spill any of the contents. If you do, you will not be able to use this dose and will have to start over with a new mixture. Swallow the mixture immediately, without chewing, followed by a cool 8-ounce glass of water. Discard the mixture if you are not able to use it immediately; do not store it to use later.
Your doctor will only prescribe doxycycline to treat a bacterial infection; it will not cure a viral infection, such as the common cold. It's important to take the full dosage schedule of doxycycline, even if you're 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 doxycycline and similar antibiotics.
If you are taking an oral suspension form of doxycycline, shake the bottle well before using. Do not use outdated doxycycline.
If you miss a dose
If you have forgotten to take a dose, take it as soon as you recall. If it is almost time for the next dose, put it off for several hours after taking the missed dose. Specifically, if you are taking one dose a day, take the next one 10 to 12 hours after the missed dose. If you are taking two doses a day, take the next one 5 to 6 hours after the missed dose. If you are taking three doses a day, take the next one 2 to 4 hours after the missed dose. Then return to your regular schedule.
Storage instructions
Doxycycline can be stored at room temperature. Protect from light and excessive heat.
Side effects may be caused by Doryx
A drug cannot anticipate producing side effects. If any develop or change in intensity, let your doctor know as soon as possible. Your doctor only can determine whether it is safe for you to continue taking doxycycline.
- More common possible effects include:
Angioedema (chest pain; swelling of face, around lips, tongue and throat, arms and legs; difficulty swallowing), bulging foreheads in infants, diarrhea, difficulty swallowing, discolored teeth in infants and children (more common during long-term use of tetracycline), inflammation of the tongue, loss of appetite, nausea, rash, rectal or genital itching, severe allergic reaction (hives, itching, and swelling), skin sensitivity to light, vomiting
When Doryx should not be prescribed
If you are either sensitive to or have ever had an allergic reaction to doxycycline or drugs of this type, you should not take Doryx. Make sure your doctor knows of any drug reactions that you have experienced.
Special warnings about Doryx
As with other antibiotics, treatment with doxycycline may result in a growth of bacteria that do not respond to Doryx and can cause a secondary infection. An overgrowth of certain bacteria in the colon could cause mild to severe--and rarely, life-threatening--diarrhea. If you develop this symptom, call your doctor immediately.
Bulging foreheads in infants and headaches in adults have occurred. These symptoms disappeared when doxycycline was discontinued.
You may become more sensitive to sunlight while taking doxycycline. Be careful if you are going out in the sun or using a sunlamp. If you develop a skin rash, notify your doctor immediately.
Birth control pills that contain estrogen may not be as effective while you are taking tetracycline drugs. Ask your doctor or pharmacist if you should use another form of birth control while taking doxycycline.
Doxycycline syrup (Vibramycin) contains a sulfite that may cause allergic reactions in certain people. This reaction happens more frequently to people with asthma.
Food and drugs that may interact with Doryx
If you take doxycycline with certain other drugs, the effects of either could be increased, decreased, or altered. It is extremely important to check with your doctor before combining doxycycline with any of the following:
Antacids containing aluminum, calcium, or magnesium, and iron-containing preparations such as Maalox, Mylanta, and others
Barbiturates such as phenobarbital
Bismuth subsalicylate (Pepto-Bismol)
Blood-thinning medications such as Coumadin
Carbamazepine (Tegretol)
Oral contraceptives
Penicillin (V-Cillin K, Pen-vee K, others)
Phenytoin (Dilantin)
Sodium bicarbonate
Special precautions if you are pregnant or breastfeeding
Doxycycline should not be used during pregnancy. Tetracycline can damage developing teeth during the last half of pregnancy. If you are pregnant or plan to become pregnant, let your doctor know immediately. Tetracyclines such as doxycycline appear in breast milk and can affect a nursing infant. If Doryx is essential to your health, your doctor may advise you to discontinue breastfeeding until your treatment is finished.
Recommended dosage of Doryx
ADULTS
The usual dose of oral doxycycline is 200 milligrams on the first day of treatment (100 milligrams every 12 hours) followed by a maintenance dose of 100 milligrams per day. The maintenance dose may be taken as a single dose or as 50 milligrams every 12 hours.
Your doctor may prescribe 100 milligrams every 12 hours for severe infections such as chronic urinary tract infection.
For Uncomplicated Gonorrhea (Except Anorectal Infections in Men)
The usual dose is 100 milligrams by mouth, twice a day for 7 days. An alternate, single-day treatment is 300 milligrams, followed in 1 hour by a second 300-milligram dose.
For Primary and Secondary Syphilis
The usual dose is 200 milligrams a day, divided into smaller, equal doses for 14 days.
For Inhalational Anthrax
To prevent or combat infection after exposure, the usual dose is 100 milligrams taken by mouth twice a day for 60 days. Treatment can be started intravenously, but should be switched to oral doses as soon as possible.
For Prevention of Malaria
The usual dose is 100 milligrams a day. Treatment should begin 1 to 2 days before travel to the area where malaria is found, then continue daily during travel in the area and 4 weeks after leaving.
CHILDREN
For children above 8 years of age, the recommended dosage schedule for those weighing 100 pounds or less is 2 milligrams per pound of body weight, divided into 2 doses, on the first day of treatment, followed by 1 milligram per pound of body weight given as a single daily dose or divided into 2 doses on subsequent days.
For more severe infections, up to 2 milligrams per pound of body weight may be used.
For inhalational anthrax in children weighing less than 100 pounds, the usual dose is 1 milligram per pound of body weight twice daily for 60 days.
For prevention of malaria, the recommended dose is 2 milligrams per 2.2 pounds of body weight up to 100 milligrams.
For children over 100 pounds, the usual adult dose should be used.
Overdosage
Any drug taken in excess can have serious consequences. If you suspect an overdose, seek medical treatment immediately.
Consumer Information (PDR)
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