<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing muscle weakness and fatigue lately, and I also have noticed an irregular heartbeat. Im wondering if there could be a magnesium deficiency which might be causing these symptoms?  <response>: Yes, that could very well be the case. I would recommend taking magnesium supplements in order to address this deficiency. There are several medications that can help with this, including magnesium sulfate, magnesium gluconate, and magnesium oxide. 