I don't take mag concurrent with other supplements and meds.
Of course I take mag citrate, which tends to help things move along a little faster. I'm not so sure I want my supplements and meds rushed along, so I take the mag a few hours prior to other stuff in the evening.
If you are taking the milder Mag gly. I'm sure it's fine.
I just need the Mag cit. for a specific reason.