See also Warning section.Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.Some products that may interact with this drug include: antihistamines applied to the skin (such as diphenhydramine cream, ointment, spray), anti-seizure medications (e.g., phenytoin, carbamazepine, phenobarbital, valproic acid), carbonic anhydrase inhibitors (e.g., acetazolamide), certain drugs for gout (uricosuric drugs such as probenecid, sulfinpyrazone), cidofovir, corticosteroids (e.g., prednisone), cyclosporine, drugs for Parkinson's disease (e.g., anticholinergics such as benztropine), isoniazid, ketoconazole, lithium, MAO inhibitors (isocarboxazid, linezolid, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine), methotrexate, pemetrexed, phenothiazines (e.g., chlorpromazine), tenofovir.This medication may increase the risk of bleeding when taken with other drugs that also may cause bleeding. Examples include anti-platelet drugs such as clopidogrel, "blood thinners" such as dabigatran/enoxaparin/warfarin, among others.Tell your doctor or pharmacist if you also take drugs that cause drowsiness such as: certain antihistamines (e.g., diphenhydramine), medicine for sleep or anxiety (e.g., alprazolam, diazepam, zolpidem), muscle relaxants, narcotic pain relievers (e.g., codeine), psychiatric medicines (e.g., risperidone, trazodone). Check all prescription and nonprescription medicine labels (e.g., cough-and-cold products, pain relievers, fever reducers) carefully since many contain ingredients that cause drowsiness.Also check your prescription and nonprescription medicine labels carefully for other ingredients that are similar to salicylamide and, if taken together, may increase your risk for side effects (NSAIDs such as aspirin, ibuprofen, ketorolac, naproxen). Low-dose aspirin should be continued if prescribed by your doctor for specific medical reasons such as heart attack or stroke prevention (usually at dosages of 81-325 milligrams per day). Consult your doctor or pharmacist for more details.This medication may interfere with certain medical/laboratory tests (including urine 5-HIAA, skin tests), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.