If you are using this medication under your doctor's direction, your healthcare professionals (e.g., doctor or pharmacist) may already be aware of any possible drug interactions and may be monitoring you for it.Before you start using this medication for self-treatment, consult your doctor or pharmacist if you are also using any prescription and nonprescription medications. Do not stop or change the dosage of any medicine before checking with your doctor or pharmacist first.This drug should not be used with the following medications because very serious interactions may occur: ketorolac, mifepristone.If you are currently using any of these medications, tell your doctor or pharmacist before starting aspirin.Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription products you may use, especially of: acetazolamide, "blood thinners" (e.g., warfarin, heparin), NSAIDs (nonsteroidal anti-inflammatory drugs such as ibuprofen, naproxen), corticosteroids (e.g., prednisone), methotrexate, oral bisphosphonates (e.g., alendronate), certain medications for gout (e.g., probenecid, sulfinpyrazone), diabetes drugs (e.g., chlorpropamide, glyburide), anti-seizure drugs (e.g., phenytoin, valproic acid), high blood pressure drugs (e.g., ACE inhibitors such as captopril, beta blockers such as metoprolol), SSRI antidepressants (e.g., fluoxetine, sertraline), "water pills" (diuretics such as furosemide, spironolactone), pemetrexed, herbal medications such as ginkgo biloba.Before using this product, consult your doctor if your child has recently received certain live vaccines (e.g., varicella vaccine, live influenza vaccine).Check all prescription and nonprescription medicine labels carefully since many medications contain pain relievers/fever reducers known as NSAIDs (non-steroidal anti-inflammatory drugs such as ibuprofen, naproxen). To prevent an overdose of aspirin, read the labels carefully before taking other pain relievers or cold products to make sure they do not contain aspirin. Ask your pharmacist about the safe use of these products.This medication may interfere with certain laboratory tests (including certain urine sugar tests), possibly causing false test results. Make sure laboratory personnel and your doctors know you are taking this medication.This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.