May 27, 2017
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(diflunisal) Tablets

Cardiovascular Risk

  • NSAIDS may cause an increased risk of serious cardiovascular thrombotic events, myocardial infarction, and stroke, which can be fatal. This risk may increase with duration of use. Patients with cardiovascular disease or risk factors for cardiovascular disease may be at greater risk. (See WARNINGS.)
  • DOLOBID (diflunisal) is contraindicated for the treatment of peri-operative pain in the setting of coronary artery bypass graft (CABG) surgery (see WARNINGS).

Gastrointestinal Risk

  • NSAIDS cause an increased risk of serious gastrointestinal adverse events including bleeding, ulceration, and perforation of the stomach or intestines, which can be fatal. These events can occur at any time during use and without warning symptoms. Elderly patients are at greater risk for serious gastrointestinal events. (See WARNINGS.)


Diflunisal is 2', 4'-difluoro-4-hydroxy-3-biphenylcarboxylic acid. Its empirical formula is C13H8F2O3 and its structural formula is:

DOLOBID® (DIFLUNISAL) Structural Formula Illustration

Diflunisal has a molecular weight of 250.20. It is a stable, white, crystalline compound with a melting point of 211-213°C. It is practically insoluble in water at neutral or acidic pH. Because it is an organic acid, it dissolves readily in dilute alkali to give a moderately stable solution at room temperature. It is soluble in most organic solvents including ethanol, methanol, and acetone.

DOLOBID* (Diflunisal) is available in 250 and 500 mg tablets for oral administration. Tablets DOLOBID (diflunisal) contain the following inactive ingredients: cellulose, FD&C Yellow 6, hydroxypropyl cellulose, hydroxypropyl methylcellulose, magnesium stearate, starch, talc, and titanium dioxide.

* Registered trademark of MERCK & CO., Inc. COPYRIGHT © 1988, 2005 MERCK & CO., Inc. All rights reserved

What are the possible side effects of diflunisal (Dolobid)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop taking diflunisal and call your doctor at once if you have any of these serious side effects:

  • chest pain, slurred speech, problems with vision or balance, and feeling weak or short of breath;
  • bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds;
  • fever, chills, body aches, flu symptoms;
  • pale or yellowed skin, dark colored urine,...

Read All Potential Side Effects and See Pictures of Dolobid »

What are the precautions when taking diflunisal (Dolobid)?

Before taking diflunisal, tell your doctor or pharmacist if you are allergic to it; or to aspirin or other salicylates (e.g., choline salicylate), or other NSAIDs (e.g., ibuprofen, naproxen, celecoxib); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: severe kidney disease, aspirin-sensitive asthma (a history of worsening breathing with runny/stuffy nose after taking aspirin or other NSAIDs), recent heart bypass surgery (CABG).

Before using this medication, tell your doctor or pharmacist your...

Read All Potential Precautions of Dolobid »

Last reviewed on RxList: 4/25/2017
This monograph has been modified to include the generic and brand name in many instances.

Dolobid - User Reviews

Dolobid User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication Dolobid sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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