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Anti-arrhythmia tablets. Tambocor tablets, an anti-arrhythmia drug. Tambocor is used to treat arrhythmia (irregular heartbeats). Tambocor is a trade name for flecainide acetate, which works by decreasing the sensitivity of heart muscle to electrical impulses. This slows and regulates the impulses in the heart muscle, which restores a regular heartbeat. Side effects associated with flecainide acetate include dizziness, nausea and hallucinations. Tambocor is known to cause or worsen heart conditions and should only be taken under strict medical supervision. (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE PERCIVAL)