Magnesium citrate is a oral laxative solution that can ease the occasional constipation. It's available over the counter (OTC) and can help produce a bowel movement in 30 minutes to 6 hours. Magnesium citrate might not be a safe option if you have kidney problems or electrolyte levels that are out of balance.
Occasional constipation
Magnesium citrate is a saline laxative. It helps your intestines hold onto water, making it easier to have a bowel movement.
Source: DailyMed
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Rare
Dizziness or fainting
flushing
irritation and pain at injection site—for intramuscular administration only
muscle paralysis
troubled breathing
Symptoms of overdose (rare in individuals with normal kidney function)
Blurred or double vision
coma
dizziness or fainting
drowsiness (severe)
increased or decreased urination
slow heartbeat
troubled breathing
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Less common (with oral magnesium)
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Works fast, produces a bowel movement within 30 minutes to 6 hours
Available OTC without a prescription
Comes in different flavors
Many generic products available
Only for use with occasional constipation
Might not be a good option for people with kidney problems or those who need to limit magnesium or sodium intake
Can cause nausea and vomiting
Needs to be separated from other medications
Magnesium citrate can start to work 30 minutes after you take it. Only take this medication when you know you'll have access to a bathroom. Avoid taking it too close to bedtime to avoid having to go to the bathroom at night.
Shake the bottle before drinking your magnesium citrate dose so you get the correct amount of medication. You can take the dose all at once, or separate it into smaller doses and take it throughout the day.
Drink a full 8 oz glass of liquid with each magnesium citrate dose to help the medication work. Doing so can help lower your risk for dehydration (low fluids in your body) and related symptoms, such as dizziness and weakness.
Talk to your provider before using magnesium citrate if you have kidney problems or need to limit how much magnesium or sodium you eat. You want to avoid having electrolyte imbalances which can worsen other health conditions.
Take your other medications at least 2 hours before or after magnesium citrate because laxatives like magnesium citrate can affect how other medications work. If you take a lot of medications, talk to your provider or pharmacist to see how long they should be separated from magnesium citrate.
Stop taking magnesium citrate and call your provider if you have taken laxatives for longer than 1 week or if your constipation lasts longer than 2 weeks. You might need more medical attention.
Magnesium citrate can cause some serious health issues. This risk may be even higher for certain groups. If this worries you, talk to your doctor or pharmacist about other options.
Stop taking magnesium citrate and call your provider if you have rectal bleeding (blood that comes from your anus) or can't have a bowel movement after taking magnesium citrate. These could be signs of a more serious problem.
Before you start taking magnesium citrate, talk to your provider first if you have stomach pain, nausea, vomiting, or if you've noticed sudden changes in your stool for more than 2 weeks. Magnesium citrate may not be the best medication for you, and your provider should make sure there's not a more serious problem going on.
Also, if you have kidney problems don't take magnesium citrate unless you've first talked with your provider. This medication might not be safe for you if you've kidney problems.
Dosage | Quantity | Price as low as | Price per unit |
---|---|---|---|
296ml | 1 bottle | $3.74 | $3.74 |
Magnesium citrate oral solution made by different manufacturers might have slightly different instructions. Make sure to read the label on your bottle before you take the medication. Typically, magnesium citrate oral solution comes in 10 fluid ounce (fl oz) bottles, and each fluid ounce of solution usually contains 1.745 grams of magnesium citrate.
Adults and children age 12 and older: The typical recommended dose is 6.5 fl oz to 10 fl oz by mouth in 24 hours, either as a single dose or in divided doses.
Children age 6 to 11: The typical recommended dose is 3 fl oz to 7 fl oz by mouth in 24 hours, either as a single dose or in divided doses.
Children age 2 to 5: The typical recommended dose is 2 fl oz to 3 fl oz by mouth in 24 hours, either as a single dose or in divided doses.
Children under 2 years of age: Ask your child's provider.
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking any of these dietary supplements, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using dietary supplements in this class with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Occasional constipation
Heartburn
Sour stomach
Indigestion
Occasional constipation and irregular bowel movements
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Atreja, A., et al. (2023). Making the most of currently available bowel preparations for colonoscopy. Cleveland Clinic Journal of Medicine.
Bionpharma, Inc. (2022). MAGNESIUM CITRATE- be health magnesium citrate oral solution - cherry liquid [package insert]. DailyMed.
Kim, J., et al. (2019). Clinical comparison of low-volume agents (oral sulfate solution and sodium picosulfate with magnesium citrate) for bowel preparation: The EASE study. Intestinal Research.
MedlinePlus (2019). Magnesium citrate.
Patel, N., et al. (2023). Bowel preparation. StatPearls.
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