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Before taking aspirin, tell your doctor if you are using any of the following drugs:

• a blood thinner such as warfarin (Coumadin); or

• another salicylate such as choline salicylate and/or magnesium salicylate (Magan, Doan's, Bayer Select Backache Pain Formula, Mobidin, Arthropan, Trilisate, Tricosal), or salsalate (Disalcid).

This list is not complete and there may be other drugs that can interact with aspirin. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

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 using this medication and call your doctor at once if you have any of these serious side effects:

• black, bloody, or tarry stools;

• coughing up blood or vomit that looks like coffee grounds;

• severe nausea, vomiting, or stomach pain;

• fever lasting longer than 3 days;

• swelling, or pain lasting longer than 10 days; or

• hearing problems, ringing in your ears.

Less serious side effects may include:

• upset stomach, heartburn;

• drowsiness; or

• headache.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.