NDC 31722-0394-33 — Magnesium Sulfate 500 mg/mL

🆔 Identity & classification

FDA NDC (as labeled) 31722-394-33

Product NDC 31722-394

11-digit billing NDC 31722039433

NCPDP billing unit ML — per mL (volume)

RxCUI 1658221, 1658236, 1658244, 1658245

UNII SK47B8698T

UPC 0331722394505, 0331722394208, 0331722394109, 0331722394314

Application # ANDA219777

SPL Set ID 647ca293-9e68-4773-947a-0fb064aa6fd1

Established class (EPC) Calculi Dissolution Agent; Osmotic Activity

Mechanism of action Magnesium Ion Exchange Activity

Physiologic effect Increased Large Intestinal Motility; Inhibition Large Intestine Fluid/Electrolyte Absorption; Inhibition Small Intestine Fluid/Electrolyte Absorption

DEA schedule Non-controlled

Marketing category ANDA

Marketing status On market

FDA listing status Listed (active directory)

Marketing start 2025-05-28

Route INTRAMUSCULAR, INTRAVENOUS

Dosage form INJECTION, SOLUTION

Substance MAGNESIUM SULFATE HEPTAHYDRATE

GPI-14 79400010402020

GCN Seq No 001417

GCN 04163

HICL code 000610

Ingredient (HICL) Magnesium Sulfate

HIC1 code C

Therapeutic class — broad (HIC1) Electrolyte Balance/Metabolism/Nutrition

HIC2 code C1

Therapeutic class — intermediate (HIC2) Drugs Affecting Electrolyte Balance

HIC3 code C1H

Therapeutic class — specific (HIC3) Magnesium Salts Replacement

AHFS code 24:04.04.92

AHFS class Antiarrhythmics, Miscellaneous

FDB label name MAGNESIUM SULFATE 50% 5 G/10ML

FDB brand name Magnesium Sulfate

Legend status F — Federal legend — prescription drug or device

TE code (Orange Book) AP · RLD · RS

Why two NDCs? The FDA registers this code as 31722-394-33 — a 5-3-2 layout, and that's what's printed on the package and shown on DailyMed. For insurance claims, every NDC is standardized to a uniform 11-digit 5-4-2 format by adding a zero to the product segment → 31722-0394-33. Same drug, same package — only the format differs.

Where does this data come from?

Identifiers from the FDA openFDA NDC Directory and Structured Product Labeling; RxCUI from RxNorm (NLM); GPI from Medi-Span; GCN / HIC / AHFS / legend from First Databank.

🏷️ RxNorm drug class

This medicine belongs to the Osmotically acting laxatives class.

Drug family (ATC) Osmotically acting laxatives, Magnesium, Electrolyte solutions

Where does this data come from?

Therapeutic classes from RxNorm RxClass (U.S. National Library of Medicine) — Established Pharmacologic Class (FDA), ATC drug family (WHO) and mechanism of action, matched by this product’s RxCUI.

🏭 Manufacturer & labeler

LabelerCamber Pharmaceuticals, Inc.

Application holderASPIRO PHARMA LTD

FDA applicationANDA219777 (ANDA)

Labeler code31722

First marketedMay 2025

Product typeHuman Prescription Drug

Portfolio603 products on file

🔎 All NDCs from Camber Pharmaceuticals, Inc.

The labeler markets the product; the application holder owns the FDA approval. They’re often the same company but can differ (e.g. a repackager or an authorized generic). A mailing address / phone appears here when the manufacturer includes it in the product’s FDA label (not all do).

Where does this data come from?

Labeler, application holder and registered establishment from the FDA openFDA NDC Directory and Drugs@FDA; address/contact from the product’s FDA label.

🩺 Clinical

Label name MAGNESIUM SULFATE 50% 5 G/10ML Ingredient Magnesium Sulfate

📗 Our plain-language guide HelloPharmacist

It's being used to protect you and your baby from seizures related to your preeclampsia. Magnesium helps calm the nerve and muscle signals that can lead to seizures — it essentiall...
I was told I'd be getting magnesium sulfate during my delivery. What is it actually doing for me?
The most common ones are flushing, warmth, and sweating — many people describe a feeling of heat spreading through their body when the infusion starts. You might also feel drowsy o...
What side effects should I expect from the IV magnesium?

📖 Read our full Magnesium Sulfate Heptahydrate guide →

Patient education

📘 MedlinePlus patient leaflet ↗

Supplement & herbal interactions

🌿 Drug–supplement interaction checker →

Where does this data come from?

Plain-language summary from MedlinePlus (U.S. National Library of Medicine); supplement & herbal interactions and nutrient depletion data from the Natural Medicines database; our full guide is HelloPharmacist editorial content.

🧪 Inactive Ingredients / Excipients

Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.

💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.

UNII 55X04QC32I
A strong alkaline chemical used to adjust and maintain the pH balance of liquid medicines. It helps keep the medicine stable and ensures it stays effective during storage.
UNII O40UQP6WCF
A strong acid used in small amounts to adjust and maintain the pH balance of a medicine, helping ensure stability and proper dissolution of the active ingredients.
UNII 059QF0KO0R
Water is a liquid solvent that dissolves and mixes ingredients together in liquid medicines, syrups, and injections. It helps distribute the active drug evenly throughout the product.

3 inactive ingredients listed in the exact product block matched to this NDC.

Where does this data come from?

Data sourced from official FDA Structured Product Labeling (SPL) via DailyMed — ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.

Inactive ingredient FAQ

Are inactive ingredients the same for every manufacturer?

No. Inactive ingredients can differ by manufacturer, dosage form, strength, and package / product version.

Why might an inactive ingredient be missing?

Some SPLs do not provide a complete structured inactive-ingredient list, and older or unusual labels may only include the information in narrative text.

Can inactive ingredients matter?

Yes. They can matter for allergies, intolerances, dyes, gluten / lactose concerns, preservatives, and formulation differences — but confirm with a pharmacist or the manufacturer when it’s clinically important.

💲 Pricing

A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.

Price system	Per mL	Per package
Retail pharmacies payNADAC · weekly	Not in the retail survey — common for institutional, discontinued, or low-volume packs.
Medicaid paysCMS SDUD · 12 mo	No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data.
Medicare drug plans payPart D · quarterly	No Part D plan price is available for this NDC in our data.
Medicare Part B allowsASP · J3475	$0.446 / J3475 unit	—

Where does this data come from?

NADAC (National Average Drug Acquisition Cost) is the CMS weekly pharmacy-acquisition-cost survey — what pharmacies pay. ASP (Average Sales Price) is the CMS Medicare Part B drug-payment file, published quarterly. Medicaid pays is computed by us from CMS State Drug Utilization Data (total reimbursed ÷ units, trailing 12 months) — gross of rebates and inclusive of dispensing fees, so it reflects what Medicaid paid, not an acquisition cost. Medicare drug plans pay is the median negotiated point-of-sale unit cost across plans listing this NDC in the CMS quarterly Prescription Drug Plan pricing files, before rebates. The VA pays is the federal contract price (FSS, and the statutory Big 4 ceiling where listed) from the VA National Acquisition Center pharmaceutical price file. All are free public government data; each measures a different payer, so the figures are not directly comparable.

🧾 Billing & reimbursement

FDA NDC (as labeled)31722-394-33

11-digit billing NDC31722-0394-33

Format5-3-2 as registered → padded to 5-4-2 for billing (zero added to the product segment)

HCPCS J-codeJ3475

DescriptorINJECTION, MAGNESIUM SULFATE, PER 500 MG

Billing units / pkg1 units

Crosswalk sourcePDAC NDC-HCPCS crosswalk (DME MAC / DMEPOS)

Where does this data come from?

The HCPCS J-code crosswalk comes from the CMS ASP NDC-HCPCS crosswalk and the DMEPDAC (DME MAC) NDC-HCPCS crosswalk — free public CMS data. Billing units are derived from the code’s descriptor and the package amount.

🔁 Therapeutic equivalents

Product	Labeler	Pack	NADAC/unit	TE	Status	Price vs. this
Magnesium Sulfate 500 mg/mL 63323-0642-20	Fresenius	25 vials	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mL 71872-7229-01	Medical	1 vial	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mL 84549-0064-11	ProPharma	10 ml	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mL 63323-0064-23	Fresenius	25 vials	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mL 70518-4375-00	REMEDYREPACK	25 vials	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mL 00404-9903-10	Henry	1 syringe	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mLthis 31722-0394-33	Camber	25 vials	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mL 71872-7142-01	Medical	1 vial	—	AP	FDA listed	—
Magnesium Sulfate 500 mg/mL 71872-7381-01	Medical	1 vial	—	AP	FDA listed	—

About this product: this is a generic version of the medicine. FDA equivalence ratings are shown when available, and other versions are listed above, least expensive first.

Where does this data come from?

Equivalents are other NDCs of the same ingredient, form and route from the openFDA NDC Directory, ranked least-expensive-first by NADAC. Therapeutic-equivalence (AB) ratings come from the FDA Orange Book; biologics use the FDA Purple Book for biosimilar & interchangeable status.

⏳ Availability & generic status

🏛️

2025

First FDA approval

May 2025

📍

2026

Currently FDA-listed

1 year listed

🔓

·

Generic on the market

this product is a generic

✅This is a generic drug

This product is an FDA-approved generic. Other versions of the same drug are listed under Therapeutic equivalents, least expensive first.

🛡️ Latest patent/protection date listed: The latest listed FDA patent/protection lapsed Feb 2026 — those protections no longer apply, though a generic still needs FDA approval and a manufacturer to market it.

📅 FDA approved May 28, 2025 AP TE-rated RLD RS

Why the date isn’t exact: Generic timing can change because patents may be challenged, settled, licensed, added, removed, or worked around with a narrower label — and FDA approval does not always mean a pharmacy can get the generic today.

Patents & exclusivity — FDA Orange Book

Exclusivity CGT

2025

Today

LOE

Substance patent Formulation patent Method-of-use patent Exclusivity Pediatric +6mo

🏛️FDA exclusivity

FDA-granted marketing protection. It’s separate from patents and may be shorter than patent protection.

🧪Product / substance patents

Patents covering the active ingredient, product, formulation, or related drug features.

🎯Method-of-use patents

Patents covering specific approved uses. These can sometimes be carved out with a “skinny label,” but not always.

🛈 What do these terms mean?

Patent: Legal protection listed in the Orange Book that may delay generic approval or launch. Issued by the U.S. Patent & Trademark Office.
Substance patent: Covers the active drug molecule itself — the hardest to design around. A generic generally can’t launch until it expires.
Formulation (product) patent: Covers a specific formulation or dosage form. A generic can sometimes work around it with a different formulation.
Method-of-use patent: A patent covering one specific approved use of the drug — not necessarily the whole molecule. A generic can sometimes launch with a “skinny label” that carves out the protected use and keeps the others.
Skinny label: A generic label that omits a still-patented use when the FDA allows it — letting a generic reach the market for the unprotected uses.
Exclusivity: FDA-granted marketing protection, separate from patents — e.g. 5-yr new chemical entity, 7-yr orphan drug, or a +6-month pediatric extension.
Paragraph IV: A generic applicant’s formal challenge to a listed patent. It can potentially lead to earlier generic entry, but often involves litigation or a settlement.
RLD / RS: Reference Listed Drug — the brand product the FDA uses as the reference for generic applications. Reference Standard — the product the FDA expects generics to compare against in bioequivalence testing.
TE / AB rating: FDA therapeutic-equivalence rating. An AB rating generally means the FDA considers a generic therapeutically equivalent to — and substitutable for — the brand.
LOE (loss of exclusivity): The latest patent or exclusivity currently listed — the loss-of-exclusivity / latest-listed-protection date shown on this page. Paragraph-IV challenges and settlements can move the real date earlier; FDA approval and a manufacturer’s decision to market can move it later.

Built from the FDA Orange Book. The bars above are scaled to each protection’s expiry; the red LOE marker is the last one to lapse.

FDA exclusivity

Code	What it grants	Expires
CGT	FDA-granted marketing exclusivity	Feb 1, 2026
CGT	FDA-granted marketing exclusivity	Feb 1, 2026

Common questions

Is there a generic version of MAGNESIUM SULFATE 50% 5 G/10ML?

Yes — an FDA-approved generic equivalent is listed in the FDA Orange Book for MAGNESIUM SULFATE 50% 5 G/10ML. See the alternatives section for substitutable, lower-cost products.

The FDA approved a generic — why can’t I get it at my pharmacy yet?

FDA approval and pharmacy availability are two different things. The FDA can approve a generic years before it actually reaches pharmacies, because the brand company may still hold patents or have a settlement that delays the launch. A manufacturer also has to choose to make and sell it, and have supply ready. So a drug can be “FDA-approved generic exists” and still be brand-only at the counter today.

Why do different websites show different generic release dates?

Generic availability is not based on one single date. Some sources use the first exclusivity expiration, some use the last product patent, and others use the latest method-of-use patent. Patent challenges, settlements, licenses, and label carve-outs can also change the real-world launch date. This page shows the underlying Orange Book dates so you can see why estimates may differ.

What does “FDA listed” mean?

It means the product appears in the FDA’s official NDC directory. That’s a good sign a product exists and is intended for the U.S. market, but on its own it does not confirm a pharmacy can fill it today. Where we have recent retail pricing data (NADAC) for a product, we label it “Availability likely” instead.

What does a patent or protection date mean here?

It’s the latest date currently listed in the FDA Orange Book for a patent or exclusivity on the brand product. It can affect when a full generic version becomes widely available — but it is not a guaranteed generic launch date. Generics sometimes arrive earlier (through a settlement or patent challenge) or later (a manufacturer still has to make and sell one).

What does “current Orange Book estimate” mean?

It means we are using the latest patent and exclusivity dates currently listed in the FDA Orange Book. It is not a guaranteed launch date.

Can a generic come out before the last patent expires?

Sometimes. A generic company may challenge a patent, settle with the brand manufacturer, receive a license, or obtain approval with a narrower label that avoids a patented use. In other cases, the last listed protection may delay full-label generic competition.

Can a generic come out after the listed dates?

Yes. Even after patents or exclusivity expire, a generic still needs FDA approval and a manufacturer must choose to market it. Supply, litigation, business decisions, or regulatory issues can delay actual availability.

What is the difference between patents and exclusivity?

Patents are legal protections usually issued by the U.S. Patent and Trademark Office. FDA exclusivity is marketing protection granted by the FDA. They are separate, and either one can affect generic timing.

Why are there multiple patent dates?

One drug can have several patents covering different things: the active ingredient, a formulation, a manufacturing process, or a specific approved use. That is why a page may show several expiration dates instead of one simple generic date.

Built from FDA Orange Book patent and exclusivity data. Dates are refreshed from public FDA data when available; the marker is max(latest patent expiry, latest exclusivity expiry). Paragraph-IV settlements and first-filer 180-day exclusivity can shift the real date; a method-of-use patent may allow an earlier skinny-label generic for non-protected indications. Generic launch timing is an estimate, not a guarantee.

Where does this data come from?

Patents and exclusivity from the FDA Orange Book (small-molecule drugs), refreshed from public FDA data. Generic launch timing is an estimate, not a guarantee.

💊 Medicaid utilization by pack size

Medicaid (SDUD) totals over the four most recent reported quarters for every package size of this drug — handy when a specific package (e.g. a starter/titration pack) carries little or no Medicaid volume on its own.

25 vials31722-0394-32 302 Rx · $277

25 vials this page31722-0394-33 No Medicaid data

25 vials31722-0394-34 No Medicaid data

25 vials31722-0394-35 No Medicaid data

Drug total (last 4 qtrs): 302 Rx · 600 units · $277 gross reimbursed

Tap a pack size to open its page. Source: CMS State Drug Utilization Data, last 4 quarters.

📊 Medicare Part D spend CMS · PART D · 2026 (Q1)

Medicare Part D (outpatient prescription) spending for Magnesium Sulfate — the program that covers self-administered drugs. 5 manufacturers.

⚠️ Drug-level data: CMS publishes Part D spending by drug, not by NDC — these figures combine every manufacturer, strength and package size sold under the name Magnesium Sulfate. That’s a different level of aggregation than the Medicaid card above, which is specific to this exact 11-digit NDC (pack size included), so the two aren’t directly comparable.

Period

Total Part D spend

$64.1K

Claims incl. refills

2.6K

Beneficiaries

506

Spend / beneficiary

$126.60

Spend / claim

$24.56

Trend by period

💵 About the dollar figures: spending is what Part D plans paid before confidential manufacturer rebates, so the program’s real net cost is lower. A blank patient count means fewer than 11 people — CMS hides counts that small to protect privacy. Source: CMS Medicare Quarterly Part D Spending by Drug (data.cms.gov), updated quarterly.

🔬 Reported adverse events (FAERS)

Read carefully: FAERS reports are voluntary and unverified. Counts are not incidence, do not establish causation, are subject to reporting bias, and cannot be used to compare one drug to another. Shown for signal context only. Reports for Magnesium Sulfate (this brand).

Top reported reactions

Nausea837

Pyrexia792

Pain704

Foetal Exposure During Pregnancy687

Premature Baby672

Diarrhoea637

Dyspnoea595

Reporter sex

Male · 40%

Female · 59%

Unknown · 0%

Serious outcomes

Death2,113

Disabling325

Reports over time (by year) — tap or hover for the count & year

Most recent year is provisional (FAERS lags ~3 months).

Where does this data come from?

Adverse-event reports from the FDA Adverse Event Reporting System (FAERS) via openFDA. FAERS reports are voluntary and unverified — counts are not incidence and don’t establish causation.

📦 Packaging — all sizes for this product

Package NDC	Description	Marketing start	Status
31722-0394-32	25 VIAL, SINGLE-DOSE in 1 CARTON (31722-394-32) / 2 mL in 1 VIAL, SINGLE-DOSE (31722-394-31)	2025-05-28	Active
31722-0394-33 You're viewing this	25 VIAL, SINGLE-DOSE in 1 CARTON (31722-394-33) / 10 mL in 1 VIAL, SINGLE-DOSE (31722-394-10)	2025-05-28	Active
31722-0394-34	25 VIAL, SINGLE-DOSE in 1 CARTON (31722-394-34) / 20 mL in 1 VIAL, SINGLE-DOSE (31722-394-20)	2025-05-28	Active
31722-0394-35	25 VIAL, SINGLE-DOSE in 1 CARTON (31722-394-35) / 50 mL in 1 VIAL, SINGLE-DOSE (31722-394-50)	2025-05-28	Active

This pack shows little to no recent Medicaid volume — a different pack size carries most fills. See all packs ↓

Pack size FAQ

What quantity is in NDC 31722-0394-33?

NDC 31722-0394-33 is listed by the FDA — 25 vial, single-dose in 1 carton / 10 ml in 1 vial, single-dose.

What NDC number is used to bill for this package of Magnesium Sulfate 500 mg/mL Injection, Solution?

Bill NDC 31722-0394-33 — the 11-digit billing format is 31722039433. Pharmacy and medical claims use the 11-digit form; the FDA label may print a shorter form of the same code.

🧭 About this NDC listing & data coverage

Finished prescription product

What data is (and isn’t) available for this NDC — tap to expand

NDC identity (package / product / labeler codes)	✓ Available
Labeler	✓ Available
Product & package description	✓ Available
Marketing category & status	✓ Available
Active ingredient / dosage form / route	✓ Available
FDA label (SPL via DailyMed)	✓ Available
Package photos	✓ Available
Inactive ingredients (structured)	✓ Available
NADAC pharmacy acquisition price (CMS)	— Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey.
Orange Book / therapeutic-equivalence data	✓ Available
HCPCS J-code billing crosswalk	✓ Available
Medicaid utilization (CMS SDUD)	— Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold.

“Not published” reflects what the public FDA / CMS / NLM sources provide for this exact package code — it is a property of the data feeds, not a judgment about the product.

Questions about this listing

Why is there no price listed?

The pricing shown on our NDC pages comes from CMS NADAC, a voluntary survey of retail community pharmacy invoices. CMS does not publish a NADAC for every NDC — packages outside the retail survey (institutional and hospital products, bulk packages, discontinued items, and many OTC items) may never receive one. A missing price reflects the survey's scope, not this product's actual cost, and does not mean the product is free or unavailable.

Is the NDC printed on the package the same as the 11-digit billing NDC?

Yes, they identify this exact package in different formats. The FDA registers it as 31722-394-33, which is what is printed on the packaging and shown on DailyMed. Insurance claims use a fixed 11-digit 5-4-2 format, so the short segment is padded with a leading zero: 31722-0394-33, written without dashes as 31722039433. The Identity section at the top of this page lists every form of this code.

What do the three segments of this NDC mean?

In 31722-0394-33, the first segment (31722) is the labeler code FDA assigned to Camber Pharmaceuticals, Inc.; the middle segment (0394) identifies this specific product — its ingredient, strength, and dosage form; and the last segment (33) identifies this exact package size and type. Together they name one specific package of one specific product.

Is this package still being marketed?

Yes, per the latest FDA NDC Directory data on this page: this package is listed as actively marketed, with no marketing end date reported by Camber Pharmaceuticals, Inc.. Listing status can change — the directory data on this page refreshes weekly.

Does this product come in other package sizes?

Yes — the FDA directory lists 3 other package presentations of this same product, including 25 vials (31722-0394-32), 25 vials (31722-0394-34), 25 vials (31722-0394-35). Each has its own NDC and its own page — see the package list near the top of this page.

Who lists this product with the FDA?

Camber Pharmaceuticals, Inc. is the labeler of record for this NDC — the company under whose FDA-assigned code the package is listed. The labeler may be the manufacturer itself or a distributor marketing the product under its own code.

Do I need a prescription for this product?

This NDC is listed with FDA as a prescription product, so it is dispensed under a prescriber's order. Your pharmacist can tell you whether any over-the-counter forms of the same medication exist.

Does this product have a billing J-code?

Yes — this NDC cross-references HCPCS code J3475 for medical-claim billing (typically used when a product is administered in a clinical setting rather than dispensed at a retail pharmacy). See the Billing section on this page.

This page identifies an FDA-listed package (the NDC) and reports public regulatory and pricing data about the listing. It is reference information, not a medical recommendation — talk to your pharmacist or prescriber about your own medication.

Where does this data come from?

Listing facts (marketing category, packager status, marketing dates) from the FDA openFDA NDC Directory; label availability from DailyMed; pricing coverage from CMS NADAC; equivalence scope from the FDA Orange Book.

📄 Full prescribing information FDA SPL

The complete FDA label for this product — the official prescribing information, verbatim, section by section. Jump with a chip, search within the label, or expand everything.

🎯 Indications and Usage ⏱️ Dosage and Administration ⛔ Contraindications ⚠️ Warnings 🤒 Adverse Reactions 🔄 Drug Interactions 🤰 Pregnancy 🧓 Geriatric Use 🆘 Overdosage 🧬 Clinical Pharmacology 📦 How Supplied / Storage and Handling 📋 Description

🎯 Indications and Usage 107 words ▾

INDICATIONS AND USAGE: Magnesium Sulfate Injection, USP is suitable for replacement therapy in magnesium deficiency, especially in acute hypomagnesemia accompanied by signs of tetany similar to those observed in hypocalcemia. In such cases, the serum magnesium level is usually below the lower limit of normal (1.5 to 2.5 mEq/L) and the serum calcium level is normal (4.3 to 5.3 mEq/L) or elevated. In total parenteral nutrition (TPN), magnesium sulfate may be added to the nutrient admixture to correct or prevent hypomagnesemia which can arise during the course of therapy.

Magnesium sulfate injection is also indicated for the prevention and control of seizures in pre-eclampsia and eclampsia, respectively.

⏱️ Dosage and Administration ~3 min read ▾

DOSAGE AND ADMINISTRATION: Dosage of magnesium sulfate must be carefully adjusted according to individual requirements and response, and administration of the drug should be discontinued as soon as the desired effect is obtained. Both IV and IM administration are appropriate. IM administration of the undiluted 50% solution results in therapeutic plasma levels in 60 minutes, whereas IV doses will provide a therapeutic level almost immediately.

The rate of IV injection should generally not exceed 150 mg/minute (1.5 mL of a 10% concentration or its equivalent), except in severe eclampsia with seizures (see below). Continuous maternal administration of magnesium sulfate in pregnancy beyond 5 to 7 days can cause fetal abnormalities. Solutions for IV infusion must be diluted to a concentration of 20% or less prior to administration.

The diluents commonly used are 5% Dextrose Injection, USP and 0.9% Sodium Chloride Injection, USP. Deep IM injection of the undiluted (50%) solution is appropriate for adults, but the solution should be diluted to a 20% or less concentration prior to such injection in children. In Magnesium Deficiency In the treatment of mild magnesium deficiency, the usual adult dose is 1 g, equivalent to 8.12 mEq of magnesium (2 mL of the 50% solution) injected IM every six hours for four doses (equivalent to a total of 32.5 mEq of magnesium per 24 hours).

For severe hypomagnesemia, as much as 250 mg (approximately 2 mEq) per kg of body weight (0.5 mL of the 50% solution) may be given IM within a period of four hours if necessary. Alternatively, 5 g (approximately 40 mEq) can be added to one liter of 5% Dextrose Injection, USP or 0.9% Sodium Chloride Injection, USP for slow IV infusion over a three-hour period. In the treatment of deficiency states, caution must be observed to prevent exceeding the renal excretory capacity.

In Hyperalimentation In TPN, maintenance requirements for magnesium are not precisely known. The maintenance dose used in adults ranges from 8 to 24 mEq (1 to 3 g) daily; for infants, the range is 2 to 10 mEq (0.25 to 1.25 g) daily. In Pre-eclampsia or Eclampsia In severe pre-eclampsia or eclampsia, the total initial dose is 10 to 14 g of magnesium sulfate.

Intravenously, a dose of 4 to 5 g in 250 mL of 5% Dextrose Injection, USP or 0.9% Sodium Chloride Injection, USP may be infused. Simultaneously, IM doses of up to 10 g (5 g or 10 mL of the undiluted 50% solution in each buttock) are given. Alternatively, the initial IV dose of 4 g may be given by diluting the 50% solution to a 10 or 20% concentration; the diluted fluid (40 mL of a 10% solution or 20 mL of a 20% solution) may then be injected IV over a period of three to four minutes.

Subsequently, 4 to 5 g (8 to 10 mL of the 50% solution) are injected IM into alternate buttocks every four hours as needed, depending on the continuing presence of the patellar reflex and adequate respiratory function. Alternatively, after the initial IV dose, some clinicians administer 1 to 2 g/hour by constant IV infusion. Therapy should continue until paroxysms cease.

A serum magnesium level of 6 mg/100 mL is considered optimal for control of seizures. A total daily (24 hr) dose of 30 to 40 g should not be exceeded. In the presence of severe renal insufficiency, the maximum dosage of magnesium sulfate is 20 grams/48 hours and frequent serum magnesium concentrations must be obtained.

Continuous use of magnesium sulfate in pregnancy beyond 5 to 7 days can cause fetal abnormalities. Other uses In counteracting the muscle-stimulating effects of barium poisoning, the usual dose of magnesium sulfate is 1 to 2 g given IV. For controlling seizures associated with epilepsy, glomerulonephritis or hypothyroidism, the usual adult dose is 1 g administered IM or IV.

In paroxysmal atrial tachycardia, magnesium should be used only if simpler measures have failed and there is no evidence of myocardial damage. The usual dose is 3 to 4 g (30 to 40 mL of a 10% solution) administered…

⛔ Contraindications 16 words ▾

CONTRAINDICATIONS: Parenteral administration of the drug is contraindicated in patients with heart block or myocardial damage.

⚠️ Warnings ~1 min read ▾

WARNINGS: FETAL HARM: Continuous administration of magnesium sulfate beyond 5 to 7 days to pregnant women can lead to hypocalcemia and bone abnormalities in the developing fetus. These bone abnormalities include skeletal demineralization and osteopenia. In addition, cases of neonatal fracture have been reported.

The shortest duration of treatment that can lead to fetal harm is not known. Magnesium sulfate should be used during pregnancy only if clearly needed. If magnesium sulfate is given for treatment of preterm labor, the woman should be informed that the efficacy and safety of such use have not been established and that use of magnesium sulfate beyond 5 to 7 days may cause fetal abnormalities.

ALUMINUM TOXICITY: This product contains aluminum that may be toxic. Aluminum may reach toxic levels with prolonged parenteral administration if kidney function is impaired. Premature neonates are particularly at risk because their kidneys are immature, and they require large amounts of calcium and phosphate solutions, which contain aluminum.

Research indicates that patients with impaired kidney function, including premature neonates, who receive parenteral levels of aluminum at greater than 4 to 5 mcg/kg/day accumulate aluminum at levels associated with central nervous system and bone toxicity. Tissue loading may occur at even lower rates of administration. Parenteral use in the presence of renal insufficiency may lead to magnesium intoxication.

IV use in eclampsia should be reserved for immediate control of life-threatening convulsions.

🤒 Adverse Reactions 51 words ▾

ADVERSE REACTIONS: The adverse effects of parenterally administered magnesium usually are the result of magnesium intoxication. These include flushing, sweating, hypotension, depressed reflexes, flaccid paralysis, hypothermia, circulatory collapse, cardiac and CNS depression proceeding to respiratory paralysis. Hypocalcemia with signs of tetany secondary to magnesium sulfate therapy for eclampsia has been reported.

🔄 Drug Interactions 118 words ▾

Drug Interactions CNS Depressants –When barbiturates, narcotics or other hypnotics (or systemic anesthetics), or other CNS depressants are to be given in conjunction with magnesium, their dosage should be adjusted with caution because of additive CNS depressant effects of magnesium. CNS depression and peripheral transmission defects produced by magnesium may be antagonized by calcium. Neuromuscular Blocking Agents –Excessive neuromuscular block has occurred in patients receiving parenteral magnesium sulfate and a neuromuscular blocking agent; these drugs should be administered concomitantly with caution.

Cardiac Glycosides –Magnesium sulfate should be administered with extreme caution in digitalized patients, because serious changes in cardiac conduction which can result in heart block may occur if administration of calcium is required to treat magnesium toxicity.

🤰 Pregnancy 138 words ▾

Pregnancy Teratogenic Effects: Pregnancy Category D (see WARNINGS and PRECAUTIONS ) See WARNINGS and PRECAUTIONS . Magnesium sulfate can cause fetal abnormalities when administered beyond 5 to 7 days to pregnant women. There are retrospective epidemiological studies and case reports documenting fetal abnormalities such as hypocalcemia, skeletal demineralization, osteopenia and other skeletal abnormalities with continuous maternal administration of magnesium sulfate for more than 5 to 7 days.

1-10 Magnesium sulfate injection should be used during pregnancy only if clearly needed. If this drug is used during pregnancy, the woman should be apprised of the potential hazard to the fetus. Nonteratogenic Effects: When administered by continuous IV infusion (especially for more than 24 hours preceding delivery) to control convulsions in a toxemic woman, the newborn may show signs of magnesium toxicity, including neuromuscular or respiratory depression (see OVERDOSAGE ).

🧓 Geriatric Use 34 words ▾

Geriatrics Geriatric patients often require reduced dosage because of impaired renal function. In patients with severe impairment, dosage should not exceed 20 g in 48 hours. Serum magnesium should be monitored in such patients.

🆘 Overdosage 123 words ▾

OVERDOSAGE: Magnesium intoxication is manifested by a sharp drop in blood pressure and respiratory paralysis. Disappearance of the patellar reflex is a useful clinical sign to detect the onset of magnesium intoxication. In the event of overdosage, artificial ventilation must be provided until a calcium salt can be injected IV to antagonize the effects of magnesium.

For Treatment of Overdose Artificial respiration is often required. Intravenous calcium, 10 to 20 mL of a 5% solution (diluted if desirable with isotonic sodium chloride for injection) is used to counteract effects of hypermagnesemia. Subcutaneous physostigmine, 0.5 to 1 mg may be helpful.

Hypermagnesemia in the newborn may require resuscitation and assisted ventilation via endotracheal intubation or intermittent positive pressure ventilation as well as IV calcium.

🧬 Clinical Pharmacology ~2 min read ▾

CLINICAL PHARMACOLOGY: Magnesium is an important cofactor for enzymatic reactions and plays an important role in neurochemical transmission and muscular excitability. As a nutritional adjunct in hyperalimentation, the precise mechanism of action for magnesium is uncertain. Early symptoms of hypomagnesemia (less than 1.5 mEq/L) may develop as early as three to four days or within weeks.

Predominant deficiency effects are neurological, e.g., muscle irritability, clonic twitching and tremors. Hypocalcemia and hypokalemia often follow low serum levels of magnesium. While there are large stores of magnesium present intracellularly and in the bones of adults, these stores often are not mobilized sufficiently to maintain plasma levels.

Parenteral magnesium therapy repairs the plasma deficit and causes deficiency symptoms and signs to cease. Magnesium prevents or controls convulsions by blocking neuromuscular transmission and decreasing the amount of acetylcholine liberated at the end-plate by the motor nerve impulse. Magnesium is said to have a depressant effect on the central nervous system (CNS), but it does not adversely affect the woman, fetus or neonate when used as directed in eclampsia or pre-eclampsia.

Normal plasma magnesium levels range from 1.5 to 2.5 mEq/L. As plasma magnesium rises above 4 mEq/L, the deep tendon reflexes are first decreased and then disappear as the plasma level approaches 10 mEq/L. At this level respiratory paralysis may occur.

Heart block also may occur at this or lower plasma levels of magnesium. Serum magnesium concentrations in excess of 12 mEq/L may be fatal. Magnesium acts peripherally to produce vasodilation.

With low doses only flushing and sweating occur, but larger doses cause lowering of blood pressure. The central and peripheral effects of magnesium poisoning are antagonized to some extent by IV administration of calcium. Pharmacokinetics With IV administration the onset of anticonvulsant action is immediate and lasts about 30 minutes.

Following IM administration, the onset of action occurs in about one hour and persists for three to four hours. Effective anticonvulsant serum levels range from 2.5 to 7.5 mEq/L. Magnesium is excreted solely by the kidneys at a rate proportional to the plasma concentration and glomerular filtration.

📦 How Supplied / Storage and Handling 107 words ▾

HOW SUPPLIED NDC No. Magnesium Sulfate Heptahydrate Fill Volume in each Vial Magnesium mg/mL Sulfate mg/mL 31722-394-32 (Unit of 25 vials) 500 mg per mL 2 mL 49.3 194.7 31722-394-33 (Unit of 25 vials) 500 mg per mL 10 mL 49.3 194.7 31722-394-34 (Unit of 25 vials) 500 mg per mL 20 mL 49.3 194.7 31722-394-35 (Unit of 25 vials) 500 mg per mL 50 mL 49.3 194.7 Do not administer unless solution is clear and seal is intact. Preservative free.

Discard unused portion. Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature]. The vial stoppers are not made with natural rubber latex.

📋 Description 167 words ▾

DESCRIPTION: Magnesium Sulfate Injection, USP is a sterile, nonpyrogenic, concentrated solution of magnesium sulfate heptahydrate in Water for Injection. It is administered by the intravenous (IV) or intramuscular (IM) routes as an electrolyte replenisher or anticonvulsant. Must be diluted before IV use.

Each mL contains: Magnesium sulfate heptahydrate, USP 500 mg; water for injection, q.s. Sulfuric acid and/or sodium hydroxide may have been added for pH adjustment. The pH of a 5% solution is between 5.5 and 7.0.

(Osmolarity: 4,060 mOsmol/L (calc.); 2.03 mM/mL magnesium sulfate anhydrous; 4.06 mEq/mL magnesium sulfate anhydrous). The solution contains no bacteriostat, antimicrobial agent or added buffer (except for pH adjustment) and is intended only for use as a single dose injection. When smaller doses are required the unused portion should be discarded with the entire unit.

Magnesium sulfate heptahydrate, USP is chemically designated MgSO 4 •7H 2 O, with a molecular weight of 246.47 and occurs as colorless crystals or white powder freely soluble in water. The chemical structure is magnesiumsulfateinjstructure

Glossary — plain-language definitions of medical terms used in this label:

contraindicated: Should not be used in that situation, because the risk is considered too high.

Adverse Reactions: Unwanted or harmful effects that people experienced while taking a medicine, listed on its official label.

Clinical Pharmacology: The label section explaining how a medicine works in the body and how the body processes it.

CNS depression: A slowing of brain and nervous-system activity that can cause drowsiness, slowed breathing, or reduced alertness.

Contraindications: A list of situations or health conditions in which a medicine should not be used because the chance of harm is too high.

depression: A lasting low mood with loss of interest that affects everyday life.

Dosage and Administration: The label section explaining how much of a medicine to use and how to take or give it.

Drug Interactions: The label section listing other medicines, foods, or substances that can change how a medicine works or raise the chance of side effects.

efficacy: How well a treatment works under the controlled conditions of a clinical study.

electrolyte: A mineral in the blood and body fluids, such as sodium, potassium, or calcium, that carries a small electric charge and helps the body work.

fetal harm: Injury or damage to a developing baby while it is growing inside the womb.

flushing: Temporary redness and warmth of the skin, often on the face and neck, from widening of small blood vessels.

hypermagnesemia: A higher-than-normal level of magnesium, a mineral, in the blood.

hypocalcemia: A lower-than-normal level of calcium, a mineral, in the blood.

hypokalemia: A lower-than-normal level of potassium, an important mineral, in the blood.

hypomagnesemia: A lower-than-normal level of magnesium, a mineral, in the blood.

hypotension: Blood pressure that is lower than normal, which can cause dizziness or fainting.

hypothyroidism: A condition where the thyroid gland makes too little thyroid hormone, which can slow the body down.

Indications and Usage: The label section stating which medical conditions the FDA has officially approved the medicine to treat, prevent, or manage.

infusion: Slowly delivering fluid or medicine into a vein over a period of time, usually through a drip.

intramuscular: An injection given deep into a muscle; often written as IM.

intravenous: Given directly into a vein through a needle or thin tube; often written as IV.

irritability: Getting annoyed, frustrated, or angry more easily than usual.

maintenance dose: The regular ongoing dose taken to keep a steady, effective amount of medicine in the body over time.

Mechanism of Action: How a medicine produces its effect in the body, described at the level of cells or body chemistry.

NDC: A unique number that identifies a specific medicine, its maker, strength, and package size.

neonatal: Relating to a newborn baby during its first four weeks of life.

osteopenia: Bones that are thinner and weaker than normal, but not as severe as osteoporosis.

Overdosage: The label section describing what can happen if too much of a medicine is taken and how it may be treated.

parenteral: Given by injection or drip into the body rather than swallowed by mouth.

Pharmacokinetics: The study of how the body takes in a medicine, spreads it around, breaks it down, and removes it over time.

plasma concentration: The amount of medicine measured in the liquid part of the blood at a given time.

pregnancy category: An older letter rating (A, B, C, D, or X) once used to describe a medicine's possible risk during pregnancy.

respiratory depression: Breathing that becomes too slow or too shallow to move enough air, so the body may not get enough oxygen.

subcutaneous: An injection placed into the fatty layer just under the skin; often written as subcut or SC.

tachycardia: A faster-than-normal heart rate, usually over 100 beats per minute.

teratogenic: Able to cause physical birth defects in a developing baby when a medicine is taken during pregnancy.

vasodilation: Widening of blood vessels, which lets more blood flow through and can lower blood pressure.

Warnings and Precautions: The label section describing serious risks to know about and safety steps to follow while using a medicine.

Source: FDA Structured Product Labeling, mirrored from DailyMed / openFDA. Prefer the government’s original formatting? View this label on DailyMed ↗

🔗 Related NDC lookups

🧪 All Magnesium Sulfate Heptahydrate NDCsSame ingredient 🏭 All Camber labeler NDCsLabeler code 31722 📚 All Calculi Dissolution Agent NDCsDrug class 🧾 J3475 billing & NDC crosswalkJ-code 📖 Read the Magnesium Sulfate Heptahydrate drug informationUses, warnings & side effects

💊 Related drugs in this class

Other drugs that share this product’s specific therapeutic class — Magnesium Salts Replacement.

Magnesium Sulfate In Water 00264-4204-52 Magnesium Sulfate/D5W 00264-4400-54 Magnesium Oxide 00603-0213-21 Magnesium Chloride 67457-0134-50

Where does this data come from?

Other drugs sharing this product’s First Databank therapeutic class (HIC3). Each links to that NDC’s page in our directory.