II. Indications

  1. Similar Indications to Tetracycline and Doxycycline
  2. SIADH (off-label)
    1. Due to its unique Vasopressin inhibition (see mechanism below)
    2. Limited evidence for use in SIADH

III. Mechanism

  1. See Tetracyclines
  2. Semi-synthetic, broad-spectrum NaphthaceneAntibiotic produced by the bacterium Streptomyces aureofaciens
  3. Inhibits Bacterial Protein synthesis
    1. Binds to Bacterial 30S ribosomal subunit
    2. Blocks aminoacyl-tRNA binding to mRNA-ribosome complex
  4. Other effects
    1. Inhibits Vasopressin activity at the renal tubules, with secondary diuresis

IV. Dosing

  1. Take on an empty Stomach, with large glass of non-dairy fluid
  2. General
    1. Take 150 mg orally four times daily (or 300 mg orally twice daily)
  3. SIADH
    1. Take 600 to 1200 mg/day divided four times orally daily
    2. Effect is delayed 5 to 14 days after dose change
      1. Avoid modifying dose more than every 4 days

V. Adverse Effects

VI. Drug Interactions

  1. Food
    1. Milk and Calcium-rich food decrease absorption
    2. Take 1 hour before or 2 hours after a meal
    3. Take with a full glass of water (risk of Pill Esophagitis)

VII. Safety

  1. Pregnancy Category D
  2. Unknown safety in Lactation

IX. References

  1. Olson (2020) Clinical Pharmacology, Medmaster Miami, p. 112-3
  2. Hamilton (2020) Tarascon Pocket Pharmacopoeia

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Ontology: Demeclocycline (C0011276)

Definition (NCI) A semi-synthetic, broad-spectrum naphthacene antibiotic produced by the bacterium Streptomyces aureofaciens. Demeclocycline binds to bacterial 30S ribosomal subunit and prevents binding of aminoacyl-tRNA to the mRNA-ribosome complex, thereby inhibiting protein synthesis. Demeclocycline also inhibits the effect of vasopressin on the renal tubules, thereby causing diuresis.
Definition (MSH) A TETRACYCLINE analog having a 7-chloro and a 6-methyl. Because it is excreted more slowly than TETRACYCLINE, it maintains effective blood levels for longer periods of time.
Concepts Antibiotic (T195) , Organic Chemical (T109)
MSH D003707
SnomedCT 372779007, 5737008, 10324005
LNC LP14988-7, MTHU002291
English Demeclocycline, Demethylchlortetracycline, 2-Naphthacenecarboxamide, 7-chloro-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-, (4S-(4alpha,4aalpha,5aalpha,6beta,12aalpha))-, demeclocycline, 7-Chloro-4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-2-naphthacenecarboxamide, Demeclocycline [Chemical/Ingredient], DEMECLOCYCLINE, Demeclocycline (product), Demeclocycline (substance)
Swedish Demeklocyklin
Czech demethylchlortetracyklin
Finnish Demeklosykliini
Russian DEMETILKHLORTETRATSIKLIN, DEMEKLOTSIKLIN, ДЕМЕКЛОЦИКЛИН, ДЕМЕТИЛХЛОРТЕТРАЦИКЛИН
Japanese デメクロサイクリン, デメチルクロルテトラサイクリン
Italian Demetilclortetraciclina, Demeclociclina
Polish Demeklocyklina
Spanish demeclociclina (producto), demeclociclina (sustancia), demeclociclina, demetilclortetraciclina, Demeclociclina, Demetilclortetraciclina
French Déméclocycline, Déméthylchlortétracycline
German Demeclocyclin, Demethylchlortetracyclin
Portuguese Demeclociclina, Demetilclortetraciclina