Yes, the intake of magnesium carbonate can potentially cause side effects, especially when used in excessive amounts, for prolonged periods, or in individuals with specific health conditions. The main side effects and related considerations are as follows:

Will there be any side effects from the intake of magnesium carbonate?
1. Gastrointestinal Discomfort
- Diarrhea: This is the most common side effect. Magnesium carbonate acts as an osmotic laxative in the intestines, and excessive intake can increase intestinal water content and peristalsis, leading to loose stools or diarrhea. The risk is higher when the dosage exceeds the recommended amount.
- Other digestive issues: Some people may experience bloating, abdominal cramps, or flatulence, which are related to the release of carbon dioxide during the neutralization of stomach acid by magnesium carbonate.
2. Electrolyte Imbalance
- Long-term or excessive use of magnesium carbonate can lead to abnormal levels of electrolytes in the body, particularly hypermagnesemia (high blood magnesium levels). This is more likely to occur in individuals with impaired renal function because the kidneys are responsible for excreting excess magnesium.
- Symptoms of hypermagnesemia may include muscle weakness, fatigue, dizziness, irregular heartbeat, and in severe cases, respiratory depression or cardiac arrest.
- Additionally, excessive loss of fluids due to diarrhea can cause imbalances in other electrolytes such as potassium and sodium.
3. Interactions with Other Substances
- Magnesium carbonate can interfere with the absorption of certain medications when taken simultaneously, including tetracycline antibiotics, fluoroquinolones, bisphosphonates (used for osteoporosis), and some thyroid medications. This may reduce the effectiveness of these drugs.
- It is generally recommended to separate the intake of magnesium carbonate and these medications by at least 2–3 hours.
4. Risks in Specific Populations
- Patients with renal insufficiency: The kidneys’ ability to excrete magnesium is compromised, so taking magnesium carbonate can easily lead to magnesium accumulation and hypermagnesemia. Such individuals should avoid using it unless directed by a doctor.
- Pregnant or breastfeeding women: Although magnesium is essential during pregnancy and lactation, the use of magnesium carbonate should be under medical supervision to avoid excessive intake affecting the mother or the baby.
- Elderly people: Due to potential age-related decline in renal function and increased sensitivity to electrolyte changes, elderly individuals are more prone to side effects and should use it cautiously.
How to Reduce the Risk of Side Effects?
- Follow the recommended dosage and duration of use as instructed by a doctor or pharmacist, and do not arbitrarily increase the dose or extend the use time.
- For individuals with kidney disease, heart disease, or electrolyte disorders, consult a healthcare provider before using magnesium carbonate-containing products.
- If side effects such as severe diarrhea, persistent abdominal pain, or weakness occur, stop using it immediately and seek medical attention promptly.
In conclusion, while magnesium carbonate is generally safe when used appropriately, it is important to be aware of the potential side effects and take precautions, especially in high-risk groups.