Product Information
Registration Status: ActiveSALOFALK 500 SUPPOSITORIES 500mg is approved to be sold in Singapore with effective from 1997-04-16. It is marketed by DCH AURIGA SINGAPORE, with the registration number of SIN09296P.
This product contains Mesalazine 500mg in the form of SUPPOSITORY. It is approved for RECTAL use.
This product is manufactured by VIFOR AG in SWITZERLAND.
It is a Prescription Only Medicine that can only be obtained from a doctor or a dentist, or a pharmacist with a prescription from a Singapore-registered doctor or dentist.
Description
An anti-inflammatory agent, structurally related to the salicylates, which is active in inflammatory bowel disease. It is considered to be the active moiety of sulphasalazine. (From Martindale, The Extra Pharmacopoeia, 30th ed)
Indication
For the treatment of active ulcerative proctitis.
Mechanism of Action
Although the mechanism of action of mesalazine is not fully understood, it appears to be topical rather than systemic. Mucosal production of arachidonic acid metabolites, both through the cyclooxygenase pathways, i.e., prostanoids, and through the lipoxygenase pathways, i.e., leukotrienes and hydroxyeicosatetraenoic acids, is increased in patients with chronic inflammatory bowel disease, and it is possible that mesalazine diminishes inflammation by blocking cyclooxygenase and inhibiting prostaglandin production in the colon.
Pharmacokinetics
- Absorption
- 20 to 30% absorbed following oral administration. 10 to 35% absorbed from the colon (rectal suppository) - extent of absorption is determined by the length of time the drug is retained in the colon.
- Distribution
- Metabolism
- Rapidly and extensively metabolized, mainly to N-acetyl-5-ASA (Ac-5-ASA) in the intestinal mucosal wall and the liver. Ac-5-ASA is further acetylated (deactivated) in at least 2 sites, the colonic epithelium and the liver.
- Elimination
Toxicity
Oral, mouse: LD50 = 3370 mg/kg; Oral, rat: LD50 = 2800 mg/kg; Skin, rabbit: LD50 = >5 gm/kg. There have been no documented reports of serious toxicity in man resulting from massive overdosing with mesalamine. Under ordinary circumstances, mesalazine absorption from the colon is limited.
Active Ingredient/Synonyms
3-carboxy-4-hydroxyaniline | 5-aminosalicylic acid | 5-ASA | m-Aminosalicylic acid | Mesalamine | Mesalazina | Mésalazine | Mesalazinum | p-Aminosalicylsaeure | Mesalazine |
Source of information: Drugbank (External Link). Last updated on: 3rd July 18. *Trade Name used in the content below may not be the same as the HSA-registered product.