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The adverse reactions observed in controlled clinical trials encompass observations in 2,427 patients.

Listed below are the adverse reactions reported in the 1,314 of these patients who received treatment in studies of two weeks or longer. Five hundred thirteen patients were treated for at least 24 weeks, 255 patients were treated for at least 48 weeks, and 46 patients were treated for 96 weeks. In general, the adverse reactions listed below were 2 to 14 times less frequent in the 1,113 patients who received short-term treatment for mild to moderate pain.

Incidence Greater Than 1%


The most frequent types of adverse reactions occurring with DOLOBID (diflunisal) are gastrointestinal: these include nausea** , vomiting, dyspepsia**, gastrointestinal pain**, diarrhea**, constipation, and flatulence.


  Somnolence, insomnia.

Central Nervous System


Special Senses





  Headache**, fatigue/tiredness.

Incidence Less Than 1 in 100

The following adverse reactions, occurring less frequently than 1 in 100, were reported in clinical trials or since the drug was marketed. The probability exists of a causal relationship between DOLOBID (diflunisal) and these adverse reactions.


Erythema multiforme, exfoliative dermatitis, Stevens-Johnson syndrome, toxic epidermal necrolysis, urticaria, pruritus, sweating, dry mucous membranes, stomatitis, photosensitivity.


Peptic ulcer, gastrointestinal bleeding, anorexia, eructation, gastrointestinal perforation, gastritis.
Liver function abnormalities; jaundice, sometimes with fever; cholestasis; hepatitis.


Thrombocytopenia; agranulocytosis; hemolytic anemia.


Dysuria; renal impairment, including renal failure; interstitial nephritis; hematuria; proteinuria.


Nervousness, depression, hallucinations, confusion, disorientation.

Central Nervous System

Vertigo; light-headedness; paresthesias.

Special Senses

Transient visual disturbances including blurred vision.

Hypersensitivity Reactions

Acute anaphylactic reaction with bronchospasm; angioedema; flushing.

Hypersensitivity vasculitis.

Hypersensitivity syndrome (see WARNINGS, Hypersensitivity Syndrome).


Asthenia, edema.

Causal Relationship Unknown

Other reactions have been reported in clinical trials or since the drug was marketed, but occurred under circumstances where a causal relationship could not be established. However, in these rarely reported events, that possibility cannot be excluded. Therefore, these observations are listed to serve as alerting information to physicians.




  Palpitation, syncope.


  Muscle cramps.


  Nephrotic syndrome.

Special Senses

 Hearing loss.


  Chest pain.

A rare occurrence of fulminant necrotizing fasciitis, particularly in association with Group A α-hemolytic streptococcus, has been described in persons treated with non-steroidal anti-inflammatory agents, including diflunisal, sometimes with fatal outcome (see also PRECAUTIONS, General).

Potential Adverse Effects

In addition, a variety of adverse effects not observed with DOLOBID (diflunisal) in clinical trials or in marketing experience, but reported with other non-steroidal analgesic/anti-inflammatory agents, should be considered potential adverse effects of DOLOBID (diflunisal) .

**Incidence between 3% and 9%. Those reactions occurring in 1% to 3% are not marked with an asterisk.