Demeclocycline Hydrochloride

DEMECLOCYCLINE HYDROCHLORIDE- demeclocycline hydrochloride tablet
Amneal Pharmaceuticals of New York, LLC


Demeclocycline HCl, USP 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.

Its structural formula is:

(click image for full-size original)

Demeclocycline HCl tablets, USP, for oral administration, contain 150 mg or 300 mg of demeclocycline HCl, USP and the following inactive ingredients: alginic acid, corn starch, ethylcellulose, FD&C Red 40 aluminum lake, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol, sodium lauryl sulfate, talc and titanium dioxide. In addition, the 150 mg tablet contains D&C Red 27 aluminum lake.



The absorption of demeclocycline is slower than that of tetracycline. The time to reach the peak concentration is about 4 hours. After a 150 mg oral dose of demeclocycline tablet, the mean concentrations at 1 hour and 3 hours are 0.46 and 1.22 mcg/mL (n=6) respectively. The serum half-life ranges between 10 and 16 hours. When demeclocycline HCl is given concomitantly with some dairy products, or antacids containing aluminum, calcium, or magnesium, the extent of absorption is reduced by more than 50%. Demeclocycline HCl penetrates well into various body fluids and tissues. The percent of demeclocycline HCl bound to plasma protein is about 40% using a dialysis equilibrium method and 90% using an ultra-filtration method. Demeclocycline HCl, like other tetracyclines, is concentrated in the liver and excreted into the bile where it is found in much higher concentrations than in the blood. The rate of demeclocycline HCl renal clearance (35 mL/min/1.73 m2) is less than half that of tetracycline. Following a single 150 mg dose of demeclocycline HCl in normal volunteers, 44% (n=8) was excreted in urine and 13% and 46%, respectively, were excreted in feces in two patients within 96 hours as active drug.


Mechanism of Action

The tetracyclines are primarily bacteriostatic and are thought to exert their antimicrobial effect by the inhibition of protein synthesis. The tetracyclines, including demeclocycline have a similar antimicrobial spectrum of activity against a wide range of gram-negative and gram-positive organisms.

Mechanism(s) of Resistance

Resistance to tetracyclines may be mediated by efflux, alteration in the target site of tetracycline, enzymatic inactivation, and decreased bacterial permeability to the tetracycline or a combination of these mechanisms.

Cross Resistance

Cross-resistance between antibiotics of the tetracycline family occurs.

Demeclocycline has been shown to be active against most isolates of the following bacteria, in vitro and/or in clinical infections as described in the INDICATIONS AND USAGE section.

Gram-positive bacteria

Bacillus anthracis

Listeria monocytogenes

Staphylococcus aureus

Streptococcus pneumoniae

Gram-negative bacteria

Bartonella bacilliformis

Brucella species

Calymmatobacterium granulomatis

Campylobacter fetus

Francisella tularensis

Haemophilus ducreyi

Haemophilus influenzae

Neisseria gonorrhoeae

Vibrio cholerae

Yersinia pestis

Because isolates of the following groups of gram-negative bacteria have been shown to be resistant to tetracyclines, culture and susceptibility testing are especially recommended:

Acinetobacter species

Enterobacter aerogenes

Escherichia coli

Klebsiella species

Shigella species

Other microorganisms

Actinomyces israelii

Borrelia recurrentis

Chlamydia psittaci

Chlamydia trachomatis

Clostridium species

Entamoeba species

Fusobacterium fusiforme

Mycoplasma pneumoniae

Propionibacterium acnes


Treponema pallidum subspecies pallidum

Treponema pallidum subspecies pertenue

Ureaplasma urealyticum

Susceptibility Test Methods

When available, the clinical microbiology laboratory should provide the results of in vitro susceptibility test results for antimicrobial drug products used in resident hospitals to the physician as periodic reports that describe the susceptibility profile of nosocomial and community-acquired pathogens. These reports should aid the physician in selecting an antibacterial drug product for treatment.

Dilution Techniques

Quantitative methods are used to determine antimicrobial minimum inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized test method (broth and/or agar)1,2,3. The MIC values should be interpreted according to the criteria in Table 1.

Diffusion Techniques

Quantitative methods that require measurement of zone diameters can also provide reproducible estimates of the susceptibility of bacteria to antimicrobial compounds. The zone size provides an estimate of the susceptibility of bacteria to antimicrobial compounds. The zone size should be determined using a standardized test method.2,4 This procedure uses paper disks impregnated with 30 mcg tetracycline to test the susceptibility of microorganisms to tetracycline. The disc diffusion interpretive criteria are provided in Table 1.

Table 1. Susceptibility Test Interpretive Criteria for Tetracycline
Minimum Inhibitory Concentration
Disk Diffusion
(zone diameters in mm)
Enterobacteriaceae, Acinetobacter
≤ 4 8 > 16 ≥ 15 12 to 14 < 11
Haemophilus influenzae < 2 4 > 8 > 29 26 to 28 < 25
Neisseria gonorrhoeae < 0.25 0.5 to 1 > 2 > 38 31 to 37 < 30
Staphylococcus aureus ≤ 4 8 ≥ 16 ≥ 19 15 to 18 ≤ 14
S. pneumoniae (non-meningitis
≤ 1 2 ≥ 4 ≥ 28 25 to 27 ≤ 24
Bacillus anthracis < 1
Franciscella tularensis < 4

A report of Susceptible indicates that the antimicrobial is likely to inhibit growth of the pathogen if the antimicrobial compound reaches the concentrations at the infection site necessary to inhibit growth of the pathogen. A report of Intermediate indicates that the result should be considered equivocal, and, if the microorganism is not fully susceptible to alternative, clinically feasible drugs, the test should be repeated. This category implies possible clinical applicability in body sites where the drug product is physiologically concentrated or in situations where a high dosage of the drug product can be used. This category also provides a buffer zone that prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of Resistant indicates that the antimicrobial is not likely to inhibit growth of the pathogen if the antimicrobial compound reaches the concentrations usually achievable at the infection site; other therapy should be selected.

Quality Control

Standardized susceptibility test procedures require the use of laboratory controls to monitor and ensure the accuracy and precision of supplies and reagents used in the assay, and the techniques of the individuals performing the test.1,2,3,4 Standard tetracycline powder should provide the following range of MIC values noted in Table 2. For the diffusion technique using the 30 mcg tetracycline disk, the criteria in Table 2 should be achieved.

Table 2. Acceptable Quality Control Ranges for Tetracycline
QC Strain Minimum Inhibitory Concentrations
Disk Diffusion
(zone diameters in mm)
*ATCC = American Type Culture Collection
Escherichia coli
ATCC* 25922
0.5 to 2 18 to 25
Staphylococcus aureus
ATCC 29213
0.12 to 1 ——-
Staphylococcus aureus
ATCC 25923
——- 24 to 30
Haemophilus influenzae
ATCC 49247
4 to 32 14 to 22
Neisseria gonorrhoeae
ATCC 49226
0.25 to 1 30 to 42
Streptococcus pneumoniae
ATCC 49619
0.06 to 0.5 27 to 31
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