Grapefruit Juice
Grapefruit juice can increase the level of
Isoptin SR in your blood, increasing your risk of side effects. Grapefruit juice should be avoided in most cases. However, if your healthcare provider decides that it is okay for you to drink grapefruit juice, you should do so consistently and in moderation.
Lithium
Lithium can interact unpredictably with Isoptin SR. Sometimes, Isoptin 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
Phenobarbital may decrease the level of Isoptin SR in your blood, perhaps making it less effective. Your healthcare provider may need to increase your
Isoptin SR dosage to prevent this interaction from occurring.
Quinidine
Isoptin SR can increase the level of quinidine in your blood, possibly 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 Isoptin SR.
Rifampin
Rifampin can greatly decrease the level of Isoptin SR in your blood, perhaps making it much less effective. In general, these medications should not be combined.
Theophylline
Isoptin SR can increase the level of
theophylline in your blood, potentially 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 Isoptin SR.
Final Thoughts on Isoptin SR Drug Interactions
It is possible that not all Isoptin SR drug interactions were discussed in this article. Therefore, you should talk with your pharmacist or healthcare provider about drug interactions that may apply to you.
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