Am I Taking Products That React With Calan SR?
Lithium (Eskalith, Eskalith CR, Lithobid)
Lithium can interact unpredictably with Calan SR. Sometimes Calan SR can make lithium less effective; other times it can increase lithium toxicity. You should be monitored very carefully when you are taking these two medications together.
Phenobarbital may decrease the level of Calan SR in your blood, perhaps making it less effective. Your healthcare provider may need to increase your Calan SR dosage.
Calan SR can increase the level of quinidine in your blood, increasing your risk of side effects. Combining these two medications may also increase your risk of low blood pressure (hypotension). Be sure to talk with your healthcare provider before taking quinidine with Calan SR.
Calan SR increases the level of simvastatin in the blood, increasing the risk of serious side effects of simvastatin. If these medications are combined, the simvastatin dosage should not exceed 10 mg per day.
Calan SR can increase the level of theophylline in your blood, increasing your risk of side effects. Your healthcare provider may need to monitor the level of theophylline in your blood, especially when starting or stopping Calan SR.