Before you begin using a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use this medication.
Carcinoid syndrome: This medication may interfere with the diagnosis of carcinoid syndrome. If you are being tested for carcinoid syndrome your doctor may suggest that you stop taking this medication 24 hours before testing.
High blood pressure: This medication may worsen high blood pressure. If you have high blood pressure, discuss with doctor whether any special monitoring is needed.
Smoking: One of the ingredients of this medication, theophylline, is cleared faster from the body if you smoke. Make sure you tell your doctor if you smoke or change the amount that you smoke (less or more) while you are taking this medication.
Theophylline blood levels: If you have reduced liver or kidney function, are over 55 years of age (especially if you are male and have chronic lung problems), have heart failure or are taking certain medications (e.g., erythromycin, clarithromycin, cimetidine, fluvoxamine), you may not clear theophylline from your body as quickly as most people and your doctor may want to check the level of theophylline in your blood. Your doctor may also want to check your blood levels if you have the flu, a viral infection, or a fever.
Pregnancy: This medication should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking this medication, contact your doctor immediately.
Breast-feeding: Theophylline and potassium iodide pass into breast milk. It is not known if mepyramine and guaifenesin pass into breast milk. If you are a breast-feeding mother and are taking this medication, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: Children are especially sensitive to some of the side effects of this medication. You must be particularly careful in giving the correct dose of this medication to a child. If you are not sure about how to measure the dose for a child or are not sure how much you are supposed to give, do not give this medication until you have spoken to a doctor or pharmacist.