DECLOMYCIN demeclocycline hydrochloride is an antibiotic isolated from a mutant strain of Streptomyces aureofaciens. Chemically it is 7-Chloro-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12, 12a-pentahydroxy-1,11-dioxo-2-naphthacenecarboxamide monohydrochloride.

DECLOMYCIN contains the following inactive ingredients:

Tablets: Alginic Acid, Corn Starch, Ethylcellulose, Hydroxypropyl Methylcellulose, Magnesium Stearate, Red 7, Sorbitol, Titanium Dioxide, Yellow 10 and other ingredients. May also contain Sodium Lauryl Sulfate.

The tetracyclines are primarily bacteriostatic and are thought to exert their antimicrobial effect by the inhibition of protein synthesis. Tetracyclines are active against a wide range of gram-negative and gram-positive organisms.

The drugs in the tetracycline class have closely similar antimicrobial spectra, and cross-resistance among them is common. Microorganisms may be considered susceptible if the MIC (minimum inhibitory concentration) is not more than 4 mcg/mL and intermediate if the MIC is 4 to 12.5 mcg/mL.

Susceptibility plate testing: A tetracycline disc may be used to determine microbial susceptibility to drugs in the tetracycline class. If the Kirby-Bauer method of disc susceptibility testing is used, a 30 mcg tetracycline disc should give a zone of at least 19 mm when tested against a tetracycline-susceptible bacterial strain.

Tetracyclines are readily absorbed and are bound to plasma proteins in varying degrees. They are concentrated by the liver in the bile and excreted in the urine and feces at high concentrations and in a biologically active form.

DECLOMYCIN demeclocycline hydrochloride is indicated in infections caused by the following microorganisms:

Rickettsiae:  (Rocky Mountain spotted fever, typhus fever and the typhus group, Q fever, rickettsialpox, tick fevers).

Mycoplasma pneumoniae (PPLO, Eaton agent).

Agents of psittacosis and ornithosis.

Agents of lymphogranuloma venereum and granuloma inguinale.

The spirochetal agent of relapsing fever ( Borrelia recurrentis ).

The following gram-negative microorganisms:

Haemophilus ducreyi chancroid

Yersinia pestis and Francisella tularensis, formerly Pasteurella pestis and Pasteurella tularensis,

Bartonella bacilliformis ,

Bacteroides species

Vibrio comma and Vibrio fetus,

Brucella  species (in conjunction with streptomycin).

Because many strains of the following groups of microorganisms have been shown to be resistant to tetracyclines, culture and susceptibility testing are recommended.

Demeclocycline is indicated for treatment of infections caused by the following gram-negative microorganisms, when bacteriologic testing indicates appropriate susceptibility to the drug:

Escherichia coli ,

Enterobacter aerogenes (formerly Aerobacter aerogenes ),

Shigella species

Mima species and Herellea species

Haemophilus influenzae  (respiratory infections),

Klebsiella species (respiratory and urinary infections).

DECLOMYCIN is indicated for treatment of infections caused by the following gram-positive microorganisms when bacteriologic testing indicates appropriate susceptibility to the drug:

Streptococcus species

Up to 44% of strains of Streptococcus pyogenes and 74% of Streptococcus faecalis have been found to be resistant to tetracycline drugs. Therefore, tetracyclines should not be used for streptococcal disease unless the organism has been demonstrated to be sensitive.

For upper respiratory infections due to Group A beta-hemolytic streptococci, penicillin is the usual drug of choice, including prophylaxis of rheumatic fever.

Streptococcus pneumoniae ,

Staphylococcus aureus, skin and soft tissue infections.

Tetracyclines are not the drugs of choice in the treatment of any type of staphylococcal infection.

When penicillin is contraindicated, tetracyclines are alternative drugs in the treatment of infections due to:

Neisseria gonorrhoeae ,

Treponema pallidum and Treponema pertenue  (syphilis and yaws),

Listeria monocytogenes ,

Clostridium species

Bacillus anthracis ,

Fusobacterium fusiforme (Vincent's infection),

Actinomyces species

In acute intestinal amebiasis, the tetracyclines may be a useful adjunct to amebicides.

DECLOMYCIN demeclocycline hydrochloride is indicated in the treatment of trachoma, although the infectious agent is not always eliminated, as judged by immunofluorescence.

Inclusion conjunctivitis may be treated with oral tetracyclines or with a combination of oral and topical agents.


This drug is contraindicated in persons who have shown hypersensitivity to any of the tetracyclines.


This adverse reaction is more common during long-term use of the drugs but has been observed following repeated short-term courses. Enamel hypoplasia has also been reported. TETRACYCLINE DRUGS, THEREFORE, SHOULD NOT BE USED IN THIS AGE GROUP UNLESS OTHER DRUGS ARE NOT LIKELY TO BE EFFECTIVE OR ARE CONTRAINDICATED.

If renal impairment exists, even usual oral or parenteral doses may lead to excessive systemic accumulation of the drug and possible liver toxicity. Under such conditions, lower than usual total doses are indicated and, if therapy is prolonged, serum level determinations of the drug may be advisable.

Phototoxic reactions can occur in individuals taking demeclocycline, and are characterized by severe burns of exposed surfaces resulting from direct exposure of patients to sunlight during therapy with moderate or large doses of demeclocycline. Patients apt to be exposed to direct sunlight or ultraviolet light should be advised that this reaction can occur, and treatment should be discontinued at the first evidence of skin erythema.

The anti-anabolic action of the tetracyclines may cause an increase in BUN. While this is not a problem in those with normal renal function, in patients with significantly impaired function, higher serum levels of tetracycline may lead to azotemia, hyperphosphatemia, and acidosis.

Administration of DECLOMYCIN has resulted in appearance of the diabetes insipidus syndrome (polyuria, polydipsia and weakness) in some patients on long-term therapy. The syndrome has been shown to be nephrogenic, dose-dependent and reversible on discontinuance of therapy.

Usage in pregnancy: (See above about use during tooth development.) Results of animal studies indicate that tetracyclines cross the placenta, are found in fetal tissues and can have toxic effects on the developing fetus (often related to retardation of skeletal development). Evidence of embryotoxicity has also been noted in animals treated early in pregnancy.

Usage in newborns, infants, and children: (See above about use during tooth development.)

All tetracyclines form a stable calcium complex in any bone forming tissue. A decrease in the fibula growth rate has been observed in prematures given oral tetracycline in doses of 25 mg/kg every six hours. This reaction was shown to be reversible when the drug was discontinued. Tetracyclines are present in the milk of lactating women who are taking a drug in this class.



Pseudotumor cerebri (benign intracranial hypertension) in adults has been associated with the use of tetracyclines. The usual clinical manifestations are headache and blurred vision. Bulging fontanels have been associated with the use of tetracyclines in infants. While both of these conditions and related symptoms usually resolve soon after discontinuation of the tetracycline, the possibility for permanent sequelae exists.

As with other antibiotic preparations, use of this drug may result in overgrowth of nonsusceptible organisms, including fungi. If superinfection occurs, the antibiotic should be discontinued and appropriate therapy should be instituted.

In venereal diseases when coexistent syphilis is suspected, darkfield examination should be done before treatment is started and the blood serology repeated monthly for at least 4 months.

In long-term therapy, periodic laboratory evaluation of organ systems, including hematopoietic, renal and hepatic studies should be performed.

All infections due to Group A beta-hemolytic streptococci should be treated for at least ten days.

Interpretation of Bacteriologic Studies: Following a course of therapy, persistence for several days in both urine and blood of bacterio-suppressive levels of demeclocycline may interfere with culture studies. These levels should not be considered therapeutic.

Drug Interactions

Because the tetracyclines have been shown to depress plasma prothrombin activity, patients who are on anticoagulant therapy may require downward adjustment of their anticoagulant dosage.

Since bacteriostatic drugs, such as the tetracycline class of antibiotics, may interfere with the bactericidal action of penicillins, it is not advisable to administer these drugs concomitantly.

Concurrent use of tetracyclines with oral contraceptives may render oral contraceptives less effective. Breakthrough bleeding has been reported.


Gastrointestinal: nausea, vomiting, diarrhea, glossitis, dysphagia, enterocolitis, pancreatitis, and inflammatory lesions (with monilial overgrowth) in the anogenital region, increases in liver enzymes, and hepatic toxicity has been reported rarely. Rare instances of esophagitis and esophageal ulcerations have been reported in patients taking the tetracycline-class antibiotics in capsule and tablet form. Most of these patients took the medication immediately before going to bed (see DOSAGE AND ADMINISTRATION ).

Skin: and erythematous rashes. Exfoliative dermatitis has been reported but is uncommon. Fixed drug eruptions, including balanitis, have been rarely reported. Photosensitivity is discussed above. (See .)

Renal toxicity: in BUN has been reported and is apparently dose related. Nephrogenic diabetes insipidus. (See .)

Hypersensitivity reactions:  Urticaria, angioneurotic edema, anaphylaxis, anaphylactoid purpura, pericarditis and exacerbation of systemic lupus erythematosus.

Blood: anemia, thrombocytopenia, neutropenia and eosinophilia have been reported.

CNS:  Pseudotumor cerebri (benign intracranial hypertension) in adults and bulging fontanels in infants (see PRECAUTIONS -- General ). Dizziness, tinnitus, and visual disturbances have been reported. Myasthenic syndrome has been reported rarely.

Other:  When given over prolonged periods, tetracyclines have been reported to produce brown-black microscopic discoloration of thyroid glands. No abnormalities of thyroid function studies are known to occur.


Therapy should be continued for at least 24 to 48 hours after symptoms and fever have subsided.

Concomitant therapy: Antacids containing aluminum, calcium, or magnesium impair absorption and should not be given to patients taking oral tetracycline.

Foods and some dairy products also interfere with absorption. Oral forms of tetracycline should be given one hour before or two hours after meals.

In patients with renal impairment: (See .) Total dosage should be decreased by reduction of recommended individual doses and/or by extending time intervals between doses.

In the treatment of streptococcal infections, a therapeutic dose of demeclocycline should be administered for at least ten days.

Adults: Usual daily dose--Four divided doses of 150 mg each or two divided doses of 300 mg each.

For children above eight years of age: Usual daily dose, 3-6 mg per pound body weight per day, depending upon the severity of the disease, divided into two to four doses.

Gonorrhea patients sensitive to penicillin may be treated with demeclocycline administered as an initial oral dose of 600 mg followed by 300 mg every 12 hours for four days to a total of 3 grams.


DECLOMYCIN® demeclocycline hydrochloride Tablets, 150 mg are round, convex, red, film coated tablets, engraved with LL on one side and D11 on the other, supplied as follows:

NDC 0005-9218-23--Bottle of 100

DECLOMYCIN® demeclocycline hydrochloride Tablets, 300 mg are round, convex, red, film coated tablets, engraved with LL on one side and D12 on the other, supplied as follows:

NDC 0005-9270-29--Bottle of 48

Store at controlled room temperature 20°-25°C (68-77°F).

Manufactured by:


American Cyanamid Company

Pearl River, NY 10965

CI 5189   Issued February 9, 1999


NOTE: These photos can be used only for identification by shape, color, and imprint. They do not depict actual or relative size.

The product samples shown here have been supplied by the manufacturer and reproduced in full color by PDR as a quick-reference identification aid. While every effort has been made to assure accurate reproduction, please remember that any visual identification should be considered preliminary. In cases of poisoning or suspected overdosage, the drug' identity should be verified by chemical analysis.