MgSO4 as analgesia?

After reading some recent posts on here I decided to explore using magnesium as an adjunct for analgesia. I was on call last night and had exlap for SBO. I did some brief research during the case and found various regimens people tried and for ease I went with the single bolus of 50mg/kg. My staff (I'm a CA3) were a little nervous as this ended up being 4g based on estimated weight of 80kg. Ended up getting 50mcg of fentanyl at induction, 100mcg around incision and 0.5mg dilaudid on... MgSO4 as analgesia?
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