Theophylline Drug Interactions (Cont.)

 
Tobacco
Tobacco can decrease the level of theophylline in your blood. If you stop using tobacco (even if you use nicotine replacement products), you may develop dangerously high levels of theophylline in your blood. Contact your healthcare provider if you plan to start or stop using tobacco products.
 
Verapamil (Calan, Verelan)
Taking theophylline with verapamil can increase the level of theophylline in your blood, which can cause dangerous side effects. If you are taking these drugs together, your healthcare provider should monitor the level of theophylline in your blood and adjust your theophylline dosage as necessary.
 

Final Thoughts on Theophylline Drug Interactions

Not every drug interaction with theophylline was discussed in this article. Therefore, you should talk with your pharmacist or healthcare provider about theophylline drug interactions that may apply to you. Because so many medications interact dangerously with theophylline, do not start or stop taking any medication (including over-the-counter medications or herbals) without first talking with your healthcare provider.

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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;