Theo-Guaia Oral

Theo-Guaia Oral 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. Doing so could change how your body gets rid of theophylline, increasing side effects or decreasing effectiveness.

Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of:

• adenosine
• adrenaline-like drugs (e.g., ephedrine, phenylephrine, pseudoephedrine)
• allopurinol
• aminoglutethimide
• certain antiarrhythmic drugs (e.g., mexiletine, propafenone, moricizine)
• anti-seizure drugs (e.g., carbamazepine, phenytoin, phenobarbital)
• benzodiazepines (e.g., diazepam, flurazepam, lorazepam)
• certain beta blockers (e.g., propranolol)
• birth control pills
• cimetidine
• digoxin
• disulfiram
• estrogen
• fluvoxamine
• interferon-alpha
• macrolide antibiotics (e.g., erythromycin, clarithromycin)
• isoproterenol
• lithium
• methotrexate
• pentoxifylline
• certain quinolones (e.g., ciprofloxacin, enoxacin)
• rifampin
• St John's wort
• sulfinpyrazone
• tacrine
• thiabendazole
• ticlopidine
• verapamil
• zileuton

Check the labels on all your medicines (e.g., cough-and-cold products, diet aids) because they may contain ingredients that could increase the side effects of this medication. Ask your pharmacist about using those products safely.

Tobacco/marijuana smoking decreases blood levels of this medication. Tell your doctor if you smoke or have recently stopped smoking. Your dose of medication may need to be adjusted.

Caffeine and alcohol can increase the side effects of this medication. Avoid drinking large amounts of beverages containing alcohol or caffeine (e.g., coffee, tea, colas), or eating large amounts of chocolate.

Certain diets (high-protein/low-carbohydrate or high-carbohydrate/low-protein) may change the effect of theophylline. Tell your doctor if you are following a dietary plan or eat beef every day. The dose of your medicine may need to be adjusted.

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Precautions and Side Effects