guaifenesin/decongestant/antihistamine - oral (cont.)
DRUG INTERACTIONS: The effects of some drugs can change if you take other drugs or herbal products at the same time. This can increase your risk for serious side effects or may cause your medications not to work correctly. These drug interactions are possible, but do not always occur. Your doctor or pharmacist can often prevent or manage interactions by changing how you use your medications or by close monitoring.To help your doctor and pharmacist give you the best care, be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products) before starting treatment with this product. While using this product, do not start, stop, or change the dosage of any other medicines you are using without your doctor's approval.Some drugs that may interact with this product include: antihistamines applied to the skin (such as diphenhydramine cream, ointment, spray), digoxin, tricyclic antidepressants (such as nortriptyline, amitriptyline), MAO inhibitors (isocarboxazid, linezolid, methylene blue, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine).Avoid taking MAO inhibitors within 2 weeks before and during treatment with this medication. In some cases a serious, possibly fatal, drug interaction may occur.Decongestants may decrease the effectiveness of some blood pressure medications (such as beta blockers, reserpine, guanethidine, methyldopa, mecamylamine).Tell your doctor or pharmacist if you are taking other products that cause drowsiness including alcohol, antihistamines (such as cetirizine, diphenhydramine), drugs for sleep or anxiety (such as alprazolam, diazepam, zolpidem), muscle relaxants, and narcotic pain relievers (such as codeine).Check the labels on all your medicines (such as cough-and-cold products, diet aids) because they may contain ingredients that could cause dizziness/drowsiness or increase your heart rate/blood pressure. Before using these products with this medication, ask your pharmacist how to use them safely.Decongestants, antihistamines and guaifenesin are available in both prescription and nonprescription products. Check the labels of all your medications carefully to make sure you are not taking more than one product containing these medications.The guaifenesin in this product can affect the results of certain lab tests (such as urine levels of certain acids). Make sure laboratory personnel and all your doctors know you use this drug.This document does not contain all possible drug interactions. Keep a list of all the products you use. Share this list with your doctor and pharmacist to lessen your risk for serious medication problems.
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