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Chemistry

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Also known as: 135-07-9, Enduron, Aquatensen, Duretic, Methyclothiazid, Methycyclothiazide
Molecular Formula
C9H11Cl2N3O4S2
Molecular Weight
360.2  g/mol
InChI Key
CESYKOGBSMNBPD-UHFFFAOYSA-N
FDA UNII
R00UUL4SRN

Methyclothiazide
A thiazide diuretic with properties similar to those of HYDROCHLOROTHIAZIDE. (From Martindale, The Extra Pharmacopoeia, 30th ed, p825)
Methyclothiazide is a Thiazide Diuretic. The physiologic effect of methyclothiazide is by means of Increased Diuresis.
1 2D Structure

Methyclothiazide

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
6-chloro-3-(chloromethyl)-2-methyl-1,1-dioxo-3,4-dihydro-16,2,4-benzothiadiazine-7-sulfonamide
2.1.2 InChI
InChI=1S/C9H11Cl2N3O4S2/c1-14-9(4-10)13-6-2-5(11)7(19(12,15)16)3-8(6)20(14,17)18/h2-3,9,13H,4H2,1H3,(H2,12,15,16)
2.1.3 InChI Key
CESYKOGBSMNBPD-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CN1C(NC2=CC(=C(C=C2S1(=O)=O)S(=O)(=O)N)Cl)CCl
2.2 Other Identifiers
2.2.1 UNII
R00UUL4SRN
2.3 Synonyms
2.3.1 Depositor-Supplied Synonyms

1. 135-07-9

2. Enduron

3. Aquatensen

4. Duretic

5. Methyclothiazid

6. Methycyclothiazide

7. Enduronum

8. Methychlothiazide

9. Methylclothiazide

10. Methylcyclothiazide

11. Methylchlorothiazide

12. Aquaresen

13. Ciba 7272-su

14. Nsc-110431

15. 2h-1,2,4-benzothiadiazine-7-sulfonamide, 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-, 1,1-dioxide

16. Aquatensen;enduron

17. Nsc 110431

18. Methyclothiazide, (+)-

19. Methyclothiazide, (-)-

20. 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-2h-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide

21. R00uul4srn

22. R6kdh2s0sx

23. 6-chloro-3-chloromethyl-2-methyl-7-sulfamyl-3,4-dihydro-1,2,4-benzothiadiazine 1,1-dioxide

24. Mls002704228

25. Chebi:6847

26. L3h46uac61

27. 6-chloro-3-(chloromethyl)-2-methyl-3,4-dihydro-2h-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide

28. Nsc110431

29. 6-chloro-3-(chloromethyl)-2-methyl-1,1-dioxo-3,4-dihydro-1$l^{6},2,4-benzothiadiazine-7-sulfonamide

30. Naturon (van)

31. Ncgc00167446-01

32. Meticlotiazida

33. Meticlotiazide

34. Methyclothiazidum

35. Meticlotiazide [dcit]

36. Dsstox_cid_3313

37. Dsstox_rid_76970

38. Dsstox_gsid_23313

39. 96783-15-2

40. Meticlotiazida [inn-spanish]

41. Methyclothiazidum [inn-latin]

42. 2h-1,2,4-benzothiadiazine-7-sulfonamide, 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-, 1,1-dioxide, (+)-

43. 2h-1,2,4-benzothiadiazine-7-sulfonamide, 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-, 1,1-dioxide, (-)-

44. 96783-14-1

45. Cas-135-07-9

46. Enduron (tn)

47. Hsdb 3363

48. Einecs 205-172-2

49. Ci-625

50. Brn 0765361

51. Unii-l3h46uac61

52. Methyclothiazide (jan/usp/inn)

53. Methyclothiazide [usan:usp:inn:ban:jan]

54. Unii-r00uul4srn

55. Unii-r6kdh2s0sx

56. Chembl1577

57. Schembl49396

58. Methyclothiazide [mi]

59. (+-)-6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-2h-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide

60. Methyclothiazide [inn]

61. Methyclothiazide [jan]

62. Methyclothiazide [hsdb]

63. Methyclothiazide [usan]

64. Gtpl7235

65. Methyclothiazide [vandf]

66. Dtxsid6023313

67. Methyclothiazide [mart.]

68. Methyclothiazide [usp-rs]

69. Methyclothiazide [who-dd]

70. Hms3264d19

71. Hms3652e06

72. Pharmakon1600-01503841

73. Hy-b0562

74. Tox21_112450

75. Nsc760078

76. S4057

77. Methyclothiazide [orange Book]

78. Akos015896465

79. Tox21_112450_1

80. Ccg-213705

81. Db00232

82. Ks-5138

83. Nsc-760078

84. Eutron Component Methyclothiazide

85. Methyclothiazide [usp Monograph]

86. Ncgc00167446-02

87. Ncgc00167446-03

88. 2h-1,2,4-benzothiadiazine-7-sulfonamide, 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-, 1,1-dioxide, (+-)-

89. 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-2h-1,2, 4-benzothiadiazine-7-sulfonamide 1,1-dioxide

90. As-12982

91. Smr001550236

92. Enduronyl Component Methyclothiazide

93. Methyclothiazide Component Of Eutron

94. Diutensen-r Component Methyclothiazide

95. Ft-0654252

96. Sw219271-1

97. Methyclothiazide Component Of Enduronyl

98. C07765

99. D00656

100. Wln: T66 Bswn Em Dhj C1 D1g Hg Iszw

101. Ab01014600_03

102. Ab01014600_04

103. Methyclothiazide Component Of Diutensen-r

104. 135m079

105. A806880

106. Q6823919

107. Brd-a95340155-001-05-5

108. 3-amino-3-(2,5-dihydroxy-phenyl)-propionicacid

109. Z1550675459

110. 6-chloro-3-(chloromethyl)-3,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide

111. (+/-)-6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-2h-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide

112. 2h-1,2,4-benzothiadiazine-7-sulfonamide, 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-, 1,1-dioxide, (+/-)-

113. 2h-1,4-benzothiadiazine-7-sulfonamide, 6-chloro-3-(chloromethyl)-3,4-dihydro-2-methyl-, 1,1-dioxide

114. 6-chloranyl-3-(chloromethyl)-2-methyl-1,1-bis(oxidanylidene)-3,4-dihydro-1$l^{6},2,4-benzothiadiazine-7-sulfonamide

115. 6-chloro-3-(chloromethyl)-2-methyl-1,1-dioxo-3,4-dihydro-1?^{6},2,4-benzothiadiazine-7-sulfonamide

116. 6-chloro-3-(chloromethyl)-2-methyl-1,1-dioxo-3,4-dihydro-16,2,4-benzothiadiazine-7-sulfonamide

117. 6-chloro-3-(chloromethyl)-2-methyl-1,1-dioxo-3,4-dihydro-1lambda6,2,4-benzothiadiazine-7-sulfonamide

118. 6-chloro-3-(chloromethyl)-2-methyl-1,1-dioxo-3,4-dihydro-2h-1$l^{6},2,4-benzothiadiazine-7-sulfonamide

119. 6-chloro-3-(chloromethyl)-2-methyl-1,1-dioxo-3,4-dihydro-2h-1lambda6,2,4-benzothiadiazine-7-sulfonamide

120. 6-chloro-3-(chloromethyl)-2-methyl-3,4-dihydro-2h-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide #

121. 6-chloro-3-(chloromethyl)-2-methyl-3,4-dihydro-2h-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 360.2 g/mol
Molecular Formula C9H11Cl2N3O4S2
XLogP31.4
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count7
Rotatable Bond Count2
Exact Mass358.9568036 g/mol
Monoisotopic Mass358.9568036 g/mol
Topological Polar Surface Area126 Ų
Heavy Atom Count20
Formal Charge0
Complexity571
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count1
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Drug Information
1 of 2  
Drug NameMethyclothiazide
PubMed HealthMethyclothiazide (Oral route)
Drug ClassesCardiovascular Agent, Diuretic, Thiazide
Drug LabelMethyclothiazide, a diuretic-antihypertensive agent, is a member of the benzothiadiazine (thiazide) class of drugs. It is an analogue of hydrochlorothiazide and occurs as a white to practically white crystalline powder which is basically odorless. Me...
Active IngredientMethyclothiazide
Dosage FormTablet
RouteOral
Strength5mg
Market StatusPrescription
CompanyMylan Pharms

2 of 2  
Drug NameMethyclothiazide
PubMed HealthMethyclothiazide (Oral route)
Drug ClassesCardiovascular Agent, Diuretic, Thiazide
Drug LabelMethyclothiazide, a diuretic-antihypertensive agent, is a member of the benzothiadiazine (thiazide) class of drugs. It is an analogue of hydrochlorothiazide and occurs as a white to practically white crystalline powder which is basically odorless. Me...
Active IngredientMethyclothiazide
Dosage FormTablet
RouteOral
Strength5mg
Market StatusPrescription
CompanyMylan Pharms

4.2 Therapeutic Uses

Diuretics, Thiazide

National Library of Medicine's Medical Subject Headings online file (MeSH, 1999)


Thiazides...may be used to control edema associated with premenstrual tension and to reduce fluid retention following administration of corticosteroids or estrogens. /thiazide diuretics/

American Medical Association, AMA Department of Drugs, AMA Drug Evaluations. 3rd ed. Littleton, Massachusetts: PSG Publishing Co., Inc., 1977., p. 81


Indications include edema associated with congestive heart failure, hepatic cirrhosis with ascites, corticosteroid and estrogen therapy, and some forms of renal function impairment including nephrotic syndrome, acute glomerulonephritis, and chronic renal failure. /Included in US product labeling; Thiazide diuretics/

MICROMEDEX Thomson Health Care. USPDI - Drug Information for the Health Care Professional. 22nd ed. Volume 1. MICROMEDEX Thomson Health Care, Greenwood Village, CO. 2002. Content Reviewed and Approved by the U.S. Pharmacopeial Convention, Inc., p. 1242


Thiazide diuretics are indicated either alone or as adjunctive therapy in the treatment of hypertension. /Included in US product labeling; Thiazide diuretics/

MICROMEDEX Thomson Health Care. USPDI - Drug Information for the Health Care Professional. 22nd ed. Volume 1. MICROMEDEX Thomson Health Care, Greenwood Village, CO. 2002. Content Reviewed and Approved by the U.S. Pharmacopeial Convention, Inc., p. 1242


For more Therapeutic Uses (Complete) data for METHYCLOTHIAZIDE (10 total), please visit the HSDB record page.


4.3 Drug Warning

Because hypokalemia accelerates glucose intolerance, fall in serum potassium level can aggravate diabetes. Diuretic therapy may cause pronounced hypokalemia in presence of incr mineralocorticoid activity due to primary adrenal disease...or corticosteroid therapy. /thiazide diuretics/

American Medical Association, AMA Department of Drugs, AMA Drug Evaluations. 3rd ed. Littleton, Massachusetts: PSG Publishing Co., Inc., 1977., p. 84


Reversible elevation of blood urea nitrogen level may occur... This prerenal azotemia is caused by decrease in renal blood flow and glomerular filtration rate secondary to reduction in blood volume induced by diuretic. ...thiazides may directly depress renal blood flow. /thiazide diuretics/

American Medical Association, AMA Department of Drugs, AMA Drug Evaluations. 3rd ed. Littleton, Massachusetts: PSG Publishing Co., Inc., 1977., p. 84


Necrotizing vasculitis of skin and kidney has occurred in elderly patients, but its relationship to thiazides is still unproved. /thiazide diuretics/

American Medical Association, AMA Department of Drugs, AMA Drug Evaluations. 3rd ed. Littleton, Massachusetts: PSG Publishing Co., Inc., 1977., p. 86


When cardiac decompensation or hypertension is accompanied by significant impairment of renal function, thiazides should be admin with caution because of their capacity to aggravate renal insufficiency. /thiazide diuretics/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 832


For more Drug Warnings (Complete) data for METHYCLOTHIAZIDE (19 total), please visit the HSDB record page.


4.4 Minimum/Potential Fatal Human Dose

3. 3= Moderately toxic: probable oral lethal dose (human) 0.5-5 g/kg, between 1 oz and 1 pint for 70 Kg person (150 lb). /thiazide diuretics/

Gosselin, R.E., H.C. Hodge, R.P. Smith, and M.N. Gleason. Clinical Toxicology of Commercial Products. 4th ed. Baltimore: Williams and Wilkins, 1976., p. II-239


4.5 Drug Indication

For use in the management of hypertension either as the sole therapeutic agent or to enhance the effect of other antihypertensive drugs in the more severe forms of hypertension. Also used as adjunctive therapy in edema associated with congestive heart failure, hepatic cirrhosis, and corticosteroid and estrogen therapy.


5 Pharmacology and Biochemistry
5.1 Pharmacology

Methyclothiazide, a diuretic-antihypertensive agent, is a member of the benzothiadiazine (thiazide) class of drugs. Methyclothiazide has a per mg natriuretic activity approximately 100 times that of the prototype thiazide, chlorothiazide. At maximal therapeutic dosages, all thiazides are approximately equal in their diuretic/natriuretic effects. Like other benzothiadiazines, methyclothiazide also has antihypertensive properties, and may be used for this purpose either alone or to enhance the antihypertensive action of other drugs.


5.2 MeSH Pharmacological Classification

Diuretics

Agents that promote the excretion of urine through their effects on kidney function. (See all compounds classified as Diuretics.)


Sodium Chloride Symporter Inhibitors

Agents that inhibit SODIUM CHLORIDE SYMPORTERS. They act as DIURETICS. Excess use is associated with HYPOKALEMIA. (See all compounds classified as Sodium Chloride Symporter Inhibitors.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
METHYCLOTHIAZIDE
5.3.2 FDA UNII
L3H46UAC61
5.3.3 Pharmacological Classes
Chemical Structure [CS] - Thiazides
5.4 ATC Code

C - Cardiovascular system

C03 - Diuretics

C03A - Low-ceiling diuretics, thiazides

C03AA - Thiazides, plain

C03AA08 - Methyclothiazide


5.5 Absorption, Distribution and Excretion

Absorption

Rapidly absorbed following oral administration.


Thiazides are absorbed from GI tract and owe their usefulness largely to their effectiveness by oral route. Absorption is relatively rapid. Most agents show demonstrable diuretic effect within hr after oral administration. /thiazide diuretics/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 831


In general, thiazides with relatively long durations of action show proportionately high degrees of both binding to plasma proteins and reabsorption by renal tubules. ... Drug passes readily through placental barrier to fetus. All thiazides probably undergo active secretion in proximal tubule. /thiazide diuretics/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 831


Methyclothiazide is absorbed from the GI tract. Little information is available on the extent of absorption and the distribution of methyclothiazide in the body. Methyclothiazide is excreted unchanged in urine.

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2002. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2002 (Plus Supplements)., p. 2554


5.6 Metabolism/Metabolites

Methyclothiazide is excreted unchanged in urine.

McEvoy, G.K. (ed.). American Hospital Formulary Service- Drug Information 2002. Bethesda, MD: American Society of Health-System Pharmacists, Inc. 2002 (Plus Supplements)., p. 2554


5.7 Mechanism of Action

Methyclothiazide appears to block the active reabsorption of chloride and possibly sodium in the ascending loop of Henle, altering electrolyte transfer in the proximal tubule. This results in excretion of sodium, chloride, and water and, hence, diuresis. As a diuretic, methyclothiazide inhibits active chloride reabsorption at the early distal tubule via the Na-Cl cotransporter, resulting in an increase in the excretion of sodium, chloride, and water. Thiazides like methyclothiazide also inhibit sodium ion transport across the renal tubular epithelium through binding to the thiazide sensitive sodium-chloride transporter. This results in an increase in potassium excretion via the sodium-potassium exchange mechanism. The antihypertensive mechanism of methyclothiazide is less well understood although it may be mediated through its action on carbonic anhydrases in the smooth muscle or through its action on the large-conductance calcium-activated potassium (KCa) channel, also found in the smooth muscle.


Acute admin of thiazides increases the excretion of uric acid. However, uric acid excretion is reduced following chronic admin... . The acute effects of inhibitors of Na+-Cl- symport on Ca2+ excretion are variable; when admin chronically, thiazide diuretics decr Ca2+ excretion. The mechanism is unknown but may involve increased proximal reabsorption due to volume depletion as well as direct effects of thiazides to incr Ca2+ reabsorption in the /distal convoluted tubule/. Thiazide diuretics may cause a mild magnesuria by a poorly understood mechanism, and there is increasing awareness that long-term use of thiazide diuretics may cause magnesium deficiency, particularly in the elderly. /Thiazide diuretics/

Hardman, J.G., L.E. Limbird, P.B., A.G. Gilman. Goodman and Gilman's The Pharmacological Basis of Therapeutics. 10th ed. New York, NY: McGraw-Hill, 2001., p. 775


Thiazides inhibit reabsorption of sodium and ...chloride in distal segment. ... As /a/ class...have important action on excretion of potassium that results from increased secretion of cation by distal tubule. ... Glomerular filtration rate may be reduced by thiazides, particularly with iv admin for exptl purposes. /thiazide diuretics/

Gilman, A. G., L. S. Goodman, and A. Gilman. (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 6th ed. New York: Macmillan Publishing Co., Inc. 1980., p. 901


Nature of chemical interaction between thiazides and specific renal receptors responsible for chloruretic effect is not known; no critical enzymatic reactions have been identified. /thiazides/

Gilman, A. G., L. S. Goodman, and A. Gilman. (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 6th ed. New York: Macmillan Publishing Co., Inc. 1980., p. 901


Thiazide diuretics increase urinary excretion of sodium and water by inhibiting sodium reabsorption in the early distal tubules. They increase the rate of delivery of tubular fluid and electrolytes to the distal sites of hydrogen and potassium ion secretion, while plasma volume contraction increases aldosterone production. The increased delivery and increase in aldosterone levels promote sodium reabsorption at the distal tubules, thus increasing the loss of potassium and hydrogen ions. /Thiazide diuretics/

MICROMEDEX Thomson Health Care. USPDI - Drug Information for the Health Care Professional. 22nd ed. Volume 1. MICROMEDEX Thomson Health Care, Greenwood Village, CO. 2002. Content Reviewed and Approved by the U.S. Pharmacopeial Convention, Inc., p. 1243


The antidiuretic effect of thiazide diuretics is a result of mild sodium and water depletion leading to increased reabsorption of glomerular filtrate in the proximal renal tubule and reduced delivery of tubular fluid available for excretion. /Thiazide diuretics/

MICROMEDEX Thomson Health Care. USPDI - Drug Information for the Health Care Professional. 22nd ed. Volume 1. MICROMEDEX Thomson Health Care, Greenwood Village, CO. 2002. Content Reviewed and Approved by the U.S. Pharmacopeial Convention, Inc., p. 1243


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