Beta-2 mimetics and magnesium: true or false friends?

Area of Science:

• Biochemistry and Physiology
• Pharmacology
• Obstetrics and Pulmonology

Background:

• Beta-2 stimulation influences magnesium status, with physiological levels potentially increasing magnesemia during deficiency, while pharmacological doses may decrease it.
• Two distinct magnesium therapies exist: nutritional, which is safe and addresses deficiency, and pharmacological, which can lead to toxicity.
• Beta-2 mimetics and magnesium are used for tocolysis, but high-dose beta-2 mimetics cause significant side effects, and pharmacological magnesium is less efficient and unsafe.

Purpose of the Study:

• To distinguish between nutritional and pharmacological magnesium therapies.
• To evaluate the safety and efficacy of magnesium therapy in obstetrical and pulmonary conditions.
• To investigate the potential benefits and risks of combining nutritional magnesium therapy with beta-2 mimetics.

Main Methods:

• Review of physiological and pharmacological effects of beta stimulation on magnesium status.
• Analysis of the efficacy and safety profiles of nutritional versus pharmacological magnesium therapy.
• Examination of clinical data regarding the use of beta-2 mimetics and magnesium in tocolysis and obstructive pulmonary diseases.

Main Results:

• Nutritional magnesium therapy is effective and non-toxic for gestational magnesium deficiency.
• High-dose intravenous magnesium sulfate (MgSO4) for tocolysis is less effective and carries risks, particularly pediatric side effects.
• Pharmacological magnesium treatment for obstructive pulmonary diseases shows limited efficacy and safety concerns, while nutritional therapy can palliate coexistent magnesium deficiency.

Conclusions:

• Maternal pharmacological magnesium therapy for tocolysis should be discontinued due to safety concerns.
• Combining nutritional magnesium therapy with beta-2 mimetics for tocolysis or pulmonary indications may be beneficial and safe.
• Further research into the therapeutic ratio of various magnesium salts is needed to guide clinical use and minimize toxicity, especially concerning the role of sulfate (SO4-).