theophylline/guaifenesin - oral, Quibron, Slo-Phyllin GG, Theom (cont.)
PRECAUTIONS: Before taking this medication, tell your doctor or pharmacist if you are allergic to it; or to similar drugs (such as dyphylline); or if you have any other allergies.Before using this medication, tell your doctor or pharmacist your medical history, especially of: heart problems (such as angina, fast/irregular heartbeat, heart failure, recent heart attack), high blood pressure, kidney disease, liver disease, seizures, stomach/intestinal ulcer, thyroid problems (underactive or overactive), a certain lung problem (cystic fibrosis), fluid in the lungs.Common illnesses may affect how this medication is removed from your body. Tell your doctor immediately if you develop a high fever (102 degrees F/39 degrees C or higher) that lasts for more than 24 hours. The dose of your medication may need to be adjusted.This medication contains 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 product safely.Before having surgery, tell your doctor or dentist that you are using this medication.This medication may be used during pregnancy as directed by your doctor. Tell your doctor if you are pregnant because your dose may need to be adjusted.This medication passes into breast milk. However, it is unlikely to harm a nursing infant. Consult your doctor before breast-feeding.
DRUG INTERACTIONS: See also How to Use section.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.This drug should not be used with the following medication because very serious interactions may occur: febuxostat.If you are currently using the medication listed above, tell your doctor or pharmacist before starting theophylline.Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: lithium.Other medications can affect the removal of this medication from your body, which may affect how this medication works. Examples include cimetidine, ciprofloxacin, disulfiram, fluvoxamine, interferon alpha, certain macrolide antibiotics (clarithromycin, erythromycin), mexiletine, nefazodone, St. John's wort, drugs to treat seizures (such as carbamazepine, phenobarbital, phenytoin), tacrine, zileuton, among others.Check the labels on all your medicines (such as cough-and-cold products, diet aids) because they may contain ingredients (such as ephedrine, pseudoephedrine, phenylephrine) that could increase the side effects of this medication. Ask your pharmacist about using those products safely.Also report the use of drugs which might increase seizure risk when combined with this medication including bupropion, isoniazid (INH), phenothiazines (such as thioridazine), tramadol, tricyclic antidepressants (such as amitriptyline), among others. Consult your doctor or pharmacist for details.Cigarette smoking decreases blood levels of this medication. Tell your doctor if you smoke or if you have recently stopped smoking.This medication may interfere with certain laboratory tests (such as stress tests, uric acid levels), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use 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.
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.
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