II. Indications

  1. FDA approved indications in adults
    1. Rheumatoid Arthritis
    2. Osteoarthritis
    3. Analgesic in mild to moderate pain

III. Contraindications

IV. Mechanism

  1. See Salicylate
  2. Difluorophenyl derivate of salicylic acid
  3. Unlike other Salicylates, Diflunisal is not metabolized to salicylic acid
    1. Results in a longer Half-Life than for other Salicylates
  4. As with other Salicylates and NSAIDs, has antipyretic, Analgesic and anti-inflammatory properties
    1. Blocks cyclooxygenase (COX, esp. COX1)
    2. Inhibits conversion of Arachidonic Acid to Prostaglandin precursors
    3. Decreasing Prostaglanding levels results in decreased pain, inflammation and fever

V. Dosing

  1. Diflunisal 250 to 500 mg orally every 8 to 12 hours
  2. Maximum: 1500 mg/day

VI. Adverse Effects

VII. Safety

  1. See Salicylate
  2. Avoid in Lactation

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Related Studies

Cost: Medications

diflunisal (on 12/21/2022 at Medicaid.Gov Survey of pharmacy drug pricing)
DIFLUNISAL 500 MG TABLET Generic $0.83 each

Ontology: Diflunisal (C0012228)

Definition (NCI) A difluorophenyl derivate of salicylic acid and a nonsteroidal anti-inflammatory drug (NSAID) with antipyretic, analgesic and anti-inflammatory properties. Diflunisal competitively inhibits both cyclooxygenase (COX) -1 and -2, with higher affinity for COX-1, and subsequently blocks the conversion of arachidonic acid to prostaglandin precursors. This leads to an inhibition of the formation of prostaglandins that are involved in pain, inflammation and fever. Diflunisal differs from other salicylates, in that it is not metabolized to salicylic acid, hence it has a longer half-life.
Definition (MSH) A salicylate derivative and anti-inflammatory analgesic with actions and side effects similar to those of ASPIRIN.
Concepts Pharmacologic Substance (T121) , Organic Chemical (T109)
MSH D004061
SnomedCT 322291002, 329609003, 363599007, 20865003, 387116004
LNC LP18552-7, MTHU004624
English Diflunisal, (1,1'-Biphenyl)-3-carboxylic acid, 2',4'-difluoro-4-hydroxy-, diflunisal, Diflunisal [CNS analgesic], Diflunisal [CNS analgesic] [see j23..], Diflunisal [musculo-skel], 2',4'-Difluoro-4-hydroxy-(1,1'-biphenyl)-3-carboxylic Acid, (1,1'-Biphenyl)-3-carboxylic Acid, 2',4'-difluoro-4-hydroxy-, Diflunisal [musculoskeletal use], diflunisal (medication), DIFLUNISAL, Diflunisal [Chemical/Ingredient], Diflunisal [CNS analgesic] [see j23..] (product), Diflunisal [musculoskeletal use] (product), Diflunisal product, Diflunisal product (substance), Difluorophenylsalicylic acid, Diflunisal (product), Diflunisal (substance), Diflunisal [CNS analgesic] [see j23..] (substance), Diflunisal [musculoskeletal use] (substance)
Swedish Diflunisal
Czech diflunisal
Finnish Diflunisaali
Russian DIFLUNISAL, ДИФЛУНИСАЛ
Japanese ドロビッド, ジフルニサール, ジフルニサル
Polish Diflunizal
Spanish diflunisal [uso musculoesquelético] (producto), diflunisal [analgésico de acción central] [véase j23..], diflunisal [uso musculoesquelético], diflunisal [analgésico de acción central] [véase j23..] (producto), diflunisal (producto), diflunisal (sustancia), diflunisal, ácido difluorofenilsalicílico, Diflunisal
French Diflunisal
German Diflunisal
Italian Diflunisal
Portuguese Diflunisal