What other drugs affect Ed-Bron G (Guaifenesin Theophylline)?
Many drugs can interact with guaifenesin and theophylline. Below is just a partial list. Tell your doctor if you are using: birth control pills an antibiotic such as ciprofloxacin (Cipro), clarithromycin (Biaxin), erythromycin (Ery-Tab, E.E.S, E-Mycin, others), ketoconazole (Nizoral), levofloxacin (Levaquin), rifampin (Rifadin, Rifamate, Rimactane) a thyroid hormone such as levothyroxine (Synthroid, Levoxyl, Levothroid, others) an interferon product such as Intron A, Alferon N, Infergen, Roferon-A, Betaseron, Avonex, Actimmune, and others a calcium channel blocker such as diltiazem (Cardizem, Dilacor XR, Tiazac), nifedipine (Procardia, Adalat), verapamil (Verelan, Calan, Isoptin), and others a beta-blocker such as atenolol (Tenormin), metoprolol (Lopressor, Toprol), propranolol (Inderal), timolol (Blocadren), and others asthma medication such as albuterol (Ventolin, Proventil, Volmax, others), salmeterol (Serevent), and others a diuretic (water pill); or seizure medication such as phen