I searched for you and only found this- it diesnt seem to have any serious side effects that I can find:
Antibiotics
The absorption of quinolone antibiotics (such as
ciprofloxacin and moxofloxacin),
tetracycline antibiotics (including tetracycline,
doxycycline, and
minocycline), and
nitrofurantoin is diminished when taken with
magnesium supplements. Therefore, magnesium should be taken two to four hours before or after taking these medications to avoid interference with absorption.