Pharmacodynamic: a joint application with potassium-sparing diuretics (triamterene, spironolactone), beta-adrenoblockers, cyclosporine, heparin, angiotensin converting enzyme (ACE) inhibitors, non-steroidal anti-inflammatory drugs increases the risk of hyperkalemia up to the development of arrhythmia and asystole. The use of potassium preparations together with glucocorticosteroids eliminates the hypokalemia caused by the latter. Under the influence of potassium, undesirable effects of cardiac glycosides decrease. Magnesium reduces the effect of neomycin, polymyxin B, tetracycline and streptomycin. Anesthetics increase the oppressive effect of magnesium preparations on the central nervous system; when applied simultaneously with atrakuronium, decamethonium,succinyl chloride and suxamethonium may enhance neuromuscular blockade; calcitriol increases the content of magnesium in blood plasma, calcium preparations reduce the effect of magnesium preparations.
Strengthens the negative dromo- and batmotropic effect of antiarrhythmic drugs.
Pharmacokinetic: astringent and enveloping agents reduce the absorption of the drug in the gastrointestinal tract.