Sucralfate

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Image:Sucralfate.png
Sucralfate
Systematic (IUPAC) name
alumane; 3,4,5-trisulfooxy-2-(sulfooxymethyl)-6- [3,4,5-trisulfooxy-2- (sulfooxymethyl) oxolan-2-yl] oxy-oxane; icosahydrate
Identifiers
CAS number	54182-58-0
ATC code	A02 BX02
PubChem	6398525
DrugBank	APRD01238
Chemical data
Formula	C₁₁H₈₇Al₉O₅₅S₈
Mol. weight	1599.14 g/mol
Pharmacokinetic data
Bioavailability	3-5% (local acting)
Metabolism	GI; liver: unknown
Half life	unknown
Excretion	feces, urine
Therapeutic considerations
Pregnancy cat.	B
Legal status	℞-only
Routes	oral, suspension, rectal suspension

Sucralfate (brand names Sucramal® in Italy; Carafate®) is an oral gastrointestinal medication primarily indicated for the treatment of active duodenal ulcers. It is also used for the treatment of gastroesophageal reflux disease (GERD) and stress ulcers. Unlike the other classes of medications used for treatment of peptic ulcers, sucralfate is a sucrose sulfate-aluminum complex that binds to the hydrochloric acid in the stomach and acts like an acid buffer with cytoprotective properties. Sucralfate was approved by the Food and Drug Administration (FDA) in 1981. Chemically, it is composed of C₁₂H₁₄O₁₁(SO₃Al(OH)₂)₈·(Al(OH)₃)_x·(H₂O)_y, where x is 8 to 10 and y is 22 to 31.

1 Mechanism of action
2 Clinical Uses
3 Adverse reactions
4 References
5 See also

[edit] Mechanism of action

Sucralfate is a locally acting substance that in an acidic environment (pH < 4), reacts with hydrochloric acid in the stomach to form a cross-linking, viscous, paste-like material capable of acting as an acid buffer for as long as 6 to 8 hours after a single dose. It also attaches to proteins on the surface of ulcers -- such as albumin and fibrinogen -- to form stable, insoluble complexes. These complexes serve as protective barriers at the ulcer surface, preventing further damage from acid, pepsin, and bile. In addition, it prevents back diffusion of hydrogen ions, and adsorbs both pepsin and bile acids. Recently, it has been indicated that sucralfate also stimulates the increase of prostaglandin E₂, epidermal growth factors (EGF, bFGF), and gastric mucus.

[edit] Clinical Uses

The only FDA-approved indication for sucralfate is for the treatment of active duodenal ulcers not related to NSAID usage because the mechanism behind these ulcers is secondary to acid oversecretion. It is not technically approved for gastric ulcers because the main mechanism is not due to acid oversecretion but rather from diminished protection. The use for sucralfate in peptic ulcer disease has diminished recently, but it is still the preferred agent for stress ulcer prophylaxis.

Active duodenal ulcer not related to NSAID use -- 1 g PO four times a day given 1 hr before meals and at bedtime for 4-8 weeks
Maintenance therapy for resolved duodenal ulcers -- 1 g PO bid on empty stomach
§ Gastric ulcer not related to NSAID use and gastritis due to GERD -- 1 g PO four times a day 1 hr before meals and at bedtime. Triple combination therapy with lansoprazole + cisapride + sucralfate can significantly improve symptoms and quality of life and was more cost-effective than ranitidine combination group. [Journal of Zhejiang University 2003 Sep-Oct; 4(5): 602-6]
§ Aphthous ulcer and stomatitis due to radiation or chemotherapy -- 5-10 mL PO suspension swish and spit/swallow four times a day.
§ Proctitis from radiation or ulcerative colitis -- 3 g/15 mL rectal suspension once or twice daily.
§ Gastro-esophageal reflux disease during pregnancy -- first-line drug therapy combined with lifestyle and diet modification. [Aliment Pharmacol Ther. 2005 Nov 1;22(9):749-57.]
§ Stress ulcer prophylaxis -- The use of sucralfate rather than H₂ antagonists for stress ulcer prophylaxis, and measures to prevent aspiration, such as semirecumbent positioning or continuous subglottic suctioning, have all been shown to reduce the risk of ventilator-associated pneumonia (VAP). [Respir Care. 2005 Jun;50(6):725-39; discussion 739-41.]
§ Prevention of stricture formation -- Sucralfate has an inhibitory effect on stricture formation in experimental corrosive burns and can be used in the treatment of corrosive esophageal burns to enhance mucosal healing and suppress stricture formation [Surg Today. 2005;35(8):617-22.]
§ Rectal bleeding and its management after irradiation for uterine cervical cancer

Grade 1 bleeding experienced immediate relief with SUCRALFATE enema for 1 month. Grade 2 bleeding, SUCRALFATE enema and/or coagulation were effective. Grade 3 bleeding lasted for 1 year despite frequent transfusions and coagulation. Grade 2 and 3 rectal bleeding occurred in 8.5% of patients. The most significant risk factor was the ICRU-CRBED. Prompt treatment with a combination of SUCRALFATE enema and coagulation is effective in controlling Grade 1 and 2 rectal bleeding without the development of fistula or stricture.

International Journal Radiation Oncology Biological Physics, 2004 Jan 1;58(1):98-105. § = not FDA-approved

[edit] Adverse reactions

The most common side effects seen are constipation and bezoar formation. Less commonly reported include flatulence, cephalalgia (headache), hypophosphatemia, and xerostomia (dry mouth).

[edit] References

International Journal Radiation Oncology Biological Physics, 2004 Jan 1;58(1):98-105. § = not FDA-approved.
Journal of Zhejiang University 2003 Sep-Oct; 4(5): 602-6
Surg Today. 2005;35(8):617-22.
Respir Care. 2005 Jun;50(6):725-39; discussion 739-41
Aliment Pharmacol Ther. 2005 Nov 1;22(9):749-57
Katzung, Bertram G. Basic and Clinical Pharmacology, 9th ed. (2004).
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