Hi, You may have too much potassium, and taking potassium and/or magnesium will make your cramps worse (magnesium increases the retention of potassium). Sometimes, people on these medications have normal potassium, but still are getting unexplained cramps, even after supplementing with magnesium. In my experience of talking to hundreds of customers, these above medications are highly connected to cramps. It s not clear how, but I suspect they are able to cause cramps. Also check for other possibilities like iron deficiency or panic attack or restless leg syndrome etc. Use muscle relaxant, check for serum potassium levels. If symptoms not improved please consult your physician he will examine and treat you accordingly. Hope I have answered your query. Let me know if I can assist you further.