Demeclocycline Hydrochloride
Indications: Amebiasis, intestinal; Chancroid; Conjunctivitis, inclusion; Granuloma inguinale; Infection, gonorrhea; Infection, sexually transmitted; Infection, skin and skin structures; Infection, syphilis; Infection, upper respiratory tract; Lymphogranuloma venereum; Ornithosis; Psittacosis; Q fever; Relapsing fever; Rickettsialpox; Rocky mountain spotted fever; Tick fever; Trachoma; Typhus fever; Vincent's infection; Yaws
DESCRIPTION:
Demeclocycline HCl is an antibiotic isolated from a mutant strain of Streptomyces aureofaciens . Chemically it is (4S-(4alpha,4aalpha,5aalpha,6beta,12aalpha))-7-Chloro-4-dimethylamino)-1,4,4a,5,5a,6,11, 12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-2-naphthacenecarboxam ide monohydrochloride.
Declomycin contains the following inactive ingredients:
Declomycin Capsules: Benzoin gum, blue 1, colloidal silicon dioxide, corn starch, FD&C yellow no. 6, ethyl vanillin, gelatin, glycerin, methylparaben, propenyl guaethol, propylene glycol, propylparaben, red 33, red 40, terpene resin, titanium dioxide, and other ingredients.
Declomycin 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.
CLINICAL PHARMACOLOGY:
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 mug/ml and intermediate if the MIC is 4-12.5 mug/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 mug 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.
INDICATIONS AND USAGE:
Demeclocycline HCl demeclocycline HCl 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.
Demeclocycline HCl 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.
CONTRAINDICATIONS:
This drug is contraindicated in persons who have shown hypersensitivity to any of the tetracyclines.
WARNINGS:
THE USE OF DRUGS OF THE TETRACYCLINE CLASS DURING TOOTH DEVELOPMENT (LAST HALF OF PREGNANCY, INFANCY AND CHILDHOOD TO THE AGE OF 8 YEARS) MAY CAUSE PERMANENT DISCOLORATION OF THE TEETH (YELLOW-GRAY-BROWN). 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 burn 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 in 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 demeclocycline HCl 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.
Pregnancy Category D: See WARNINGS about use during tooth development. Results of animal studies indicate that tetracyclines cross the placets, 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 WARNINGS about use during tooth development.
All tetracyclines form stable calcium complex in 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 mild of lactating women who are taking a drug in this class.
PRECAUTIONS:
General
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 tetracyclines, 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 lower dose of anticoagulants.
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.
ADVERSE REACTIONS:
Gastrointestinal: Anorexia, 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: Maculopapular and erythematous rashes. Exfoliative dermatitis has been reported but is uncommon. Photosensitivity is discussed above. (See WARNINGS).
Renal toxicity: Rise in BUN has been reported and is apparently dose related. Nephrogenic diabetes insipidus. (See WARNINGS).
Hypersensitivity Reactions: Urticaria, angioneurotic edema, anaphylaxis, anaphylactoid purpura, pericarditis and exacerbation of systemic lupus erythematosus.
Blood: Hemolytic 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.
DOSAGE AND ADMINISTRATION:
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 diary 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 WARNINGS). Total dosage should be decreased by reduction 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.