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PRECAUTIONS: Before taking guaifenesin with dextromethorphan, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies.Before using this medication, tell your doctor or pharmacist your medical history, especially of: lung disease (e.g., asthma, emphysema), high blood pressure.This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.This medicine may contain aspartame. If you have phenylketonuria (PKU) or any other condition that requires you to restrict your intake of aspartame (or phenylalanine), consult your doctor or pharmacist about using this drug safely.This medication should be used only if clearly needed during pregnancy. Discuss the risks and benefits with your doctor.It is not known whether this drug passes into breast milk. Breast-feeding is not recommended while using this drug. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.Avoid taking MAO inhibitors (e.g., furazolidone, isocarboxazid, linezolid, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine) within 2 weeks before or after treatment with this medication. In some cases a serious, possibly fatal, drug interaction may occur.Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: memantine.This medication may interfere with certain laboratory tests (including urine 5-HIAA/VMA test), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.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.

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. Need help identifying pills and medications? Use the pill identifier tool on RxList.