NO: You can not overdose on magnesium if your kidneys are normal as the excess will be removed in urine or stool as magnesium causes diarrhea. Since you take Phentermine which can increase heart rate and cause arrythmias the concomitant use of magnesium has potential to cause harm as high level of magnesium can affect heart rate. Stop your Phentermine and then you can take magnesium supplements.
Answered 1/17/2019
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