<unk> (extended-release tablet) is an antiarrhythmic that is FDA approved for the {{{indicationType}}} of symptomatic atrial fibrillation/flutter and life-threatening ventricular arrhythmias. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include diarrhea, nausea, vomiting, heartburn, and esophagitis.
Quinidine gluconate 
Quinidine sulfate
Tizanidine
Lofexidine
Nefopam
Oxicam
Magnesium lactate
Dimetilan