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“Smoking enhances caffeine clearance in both healthy volunteers and patients with severe hepatic disorders, whereas co-medication with mexiletine strongly inhibits caffeine elimination.”
“In an acute experiment in healthy volunteers and in patients under long-term treatment for cardiac arrhythmias, mexiletine inhibits caffeine elimination by about 50%.”
“Some side effects of mexiletine may possibly at least partially be attributable to a retention of caffeine.”