Magnesium Citrate Shortage: What Providers and Prescribers Need to Know in 2026

Magnesium citrate is not in an FDA-declared shortage in 2026 — but that doesn't mean your patients will always find it on the shelf. As a provider who uses magnesium citrate in colonoscopy prep protocols, recommends it for constipation, or prescribes supplemental magnesium for deficiency, you should understand the landscape so you can counsel patients accurately and have contingency plans in place.

Current Supply Status (2026)

As of 2026, the FDA's Drug Shortage Database does not list magnesium citrate as a drug in shortage. Magnesium citrate is an OTC product manufactured by multiple companies — including Humco, Braintree Laboratories, and a large field of generic store-brand manufacturers — meaning supply disruptions at any one producer do not create a system-wide shortage. Retail prices remain low ($5–$15 per 10 fl oz bottle), and the product continues to be distributed broadly through pharmacy chains, grocery stores, and online retailers.

Why Patients Still Report Availability Problems

Even in the absence of a national shortage, your patients may encounter localized stock-outs driven by:

• Colonoscopy prep clustering: When a GI practice issues colonoscopy prep instructions to multiple patients simultaneously, demand at nearby pharmacies spikes acutely. Small independent pharmacies and clinic-adjacent pharmacies are most susceptible.
• Supplement demand: The growing consumer wellness trend around magnesium for sleep and stress relief has driven sales of magnesium citrate capsules and tablets, occasionally depleting store inventory.
• Seasonal variation: Constipation rates increase post-holiday and in older adults during winter months, increasing demand for all OTC laxatives.

Clinical Guidance for Colonoscopy Prep

If a patient calls your office because they cannot find magnesium citrate for their scheduled prep, you have several well-validated alternative protocols:

• Split-dose PEG (MiraLAX + bisacodyl): MiraLAX 238 g + 64 oz clear liquid, split between the evening before and the morning of the procedure, combined with 2 bisacodyl 5 mg tablets. This is a well-validated, widely-used protocol with equivalent mucosal visualization.
• SUPREP (sodium sulfate/potassium sulfate/magnesium sulfate): A lower-volume prescription prep that does not require magnesium citrate. Insurance coverage varies.
• PLENVU or SUTAB: Prescription low-volume formulations that do not rely on magnesium citrate. Particularly useful for patients with electrolyte or kidney concerns.

Prescribing Considerations for Magnesium Supplementation

When recommending magnesium citrate as a supplement:

• Bioavailability: Magnesium citrate has estimated fractional intestinal absorption of 20–40%, substantially higher than magnesium oxide (~4–10%). This makes it among the preferred forms for treating documented hypomagnesemia.
• GI tolerability: Higher doses can cause osmotic diarrhea; counsel patients to start at 100–200 mg and titrate up as tolerated.
• Renal impairment: Avoid or use with extreme caution in CKD Stage 3–5. The kidneys' reduced ability to excrete magnesium can lead to hypermagnesemia, which manifests as confusion, hypotension, bradycardia, and neuromuscular depression.
• Drug interactions: Counsel patients taking tetracyclines, fluoroquinolones (ciprofloxacin), or HIV integrase inhibitors (dolutegravir, bictegravir) to separate these medications by at least 2–6 hours from magnesium citrate due to chelation-mediated absorption reduction. Eltrombopag has a contraindicated interaction — separate by at least 4 hours.

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Helping Patients Find Magnesium Citrate

When patients have trouble locating magnesium citrate (or any medication), medfinder for providers can help. Patients submit their medication and location, medfinder calls local pharmacies, and results are texted to the patient — reducing the burden on your office staff and preventing no-shows or inadequate prep.

Key Takeaways for Providers

• No national shortage of magnesium citrate exists in 2026; local stock-outs are temporary and store-specific.
• Have a documented alternate colonoscopy prep protocol (e.g., split-dose PEG) to deploy quickly when patients cannot source magnesium citrate.
• Screen for renal impairment and interacting medications before recommending or prescribing magnesium citrate as a supplement or prep agent.
• See our full provider guide to helping patients find magnesium citrate for step-by-step resources.