From the FDA Drug Label
adults and children 12 years of age and over - 6.5 to 10 fl oz maximum 10 fl oz in 24 hours The recommended liquid amount of magnesium citrate for adults is 6.5 to 10 fl oz, with a maximum of 10 fl oz in 24 hours 1.
- The dose may be taken as a single daily dose or in divided doses.
- It is recommended to drink a full glass (8 ounces) of liquid with each dose.
From the Research
The recommended liquid amount of magnesium citrate for adults is typically 10 ounces (300 mL) taken as a single dose. This clear, lemon-flavored solution is commonly used as a saline laxative to treat occasional constipation or to empty the bowels before certain medical procedures. When taking magnesium citrate, it's best to drink it chilled for better taste and follow it with a full glass (8 ounces) of water to prevent dehydration. The medication usually produces a bowel movement within 30 minutes to 6 hours after consumption. It works by drawing water into the intestines and stimulating bowel motility.
Key Considerations
- Adults should not exceed the recommended dose within a 24-hour period, and this product should not be used for more than 1 week unless directed by a healthcare provider.
- If you have kidney disease, heart conditions, or are on certain medications, consult with your healthcare provider before using magnesium citrate as it may not be appropriate for everyone.
- The bioavailability of magnesium from magnesium citrate is supported by studies such as 2, which found that magnesium citrate had greater absorption compared to other magnesium preparations.
- Recent studies like 3 also highlight the importance of magnesium supplementation, showing that it can increase urine magnesium and citrate levels in stone formers with hypomagnesuria.
- However, it's essential to note that the tolerable upper intake level for magnesium in nutritional supplements, water, or added to food and beverages is 250 mg/day, as mentioned in 4.
Administration and Safety
- Magnesium citrate should be taken as directed, and it's crucial to follow the recommended dosage to avoid potential side effects.
- Patients with certain medical conditions or taking specific medications should exercise caution when using magnesium citrate, as it may interact with other medications or worsen underlying health conditions.
- As with any medication, it's essential to monitor for potential side effects and report them to a healthcare provider if they occur.