Magnesium Sulfate 80mg/ml Inj, 50ml

Manufacturer WG CRITICAL CARE Active Ingredient Magnesium Sulfate Injection(mag NEE zhum SUL fate) Pronunciation mag-NEE-zhum SUL-fate
It is used to treat or prevent low magnesium levels.It is used to prevent and control seizures during pregnancy.It may be given to you for other reasons. Talk with the doctor.
đŸˇī¸
Drug Class
Anticonvulsant; Electrolyte Supplement; Tocolytic
đŸ§Ŧ
Pharmacologic Class
Mineral; Magnesium Salt
🤰
Pregnancy Category
Category D
✅
FDA Approved
Jan 1970
âš–ī¸
DEA Schedule
Not Controlled

Overview

â„šī¸

What is this medicine?

Magnesium sulfate is a mineral given by injection, often into a vein. It's used for various conditions, including preventing seizures in pregnant women with preeclampsia, treating low magnesium levels, and sometimes for severe asthma attacks. It works by relaxing muscles and calming the nervous system.
📋

How to Use This Medicine

Taking Your Medication

To use this medication correctly, follow your doctor's instructions and read all the information provided. It's essential to follow the instructions carefully. This medication is administered either as an injection into a muscle or as an infusion into a vein, which is given over a period of time.

Storing and Disposing of Your Medication

If you need to store this medication at home, consult with your doctor, nurse, or pharmacist to determine the best way to store it.

Missing a Dose

If you miss a dose, contact your doctor to find out what steps to take next.
💡

Lifestyle & Tips

  • Report any unusual symptoms immediately, such as difficulty breathing, muscle weakness, or feeling very drowsy.
  • Inform healthcare providers about all medications you are taking, especially other sedatives or muscle relaxants.
  • Maintain adequate hydration as advised by your doctor.

Dosing & Administration

đŸ‘¨â€âš•ī¸

Adult Dosing

Standard Dose: Varies significantly by indication. For eclampsia/preeclampsia: 4-5 g IV over 15-20 min, followed by 1-2 g/hour IV infusion. For hypomagnesemia: 1-4 g IV over 1-4 hours, depending on severity.
Dose Range: 1 - 10 mg

Condition-Specific Dosing:

Eclampsia/Preeclampsia: Loading dose: 4-5 g IV over 15-20 min. Maintenance: 1-2 g/hour IV infusion. Max 30-40 g/24 hours.
Hypomagnesemia (mild): 1 g IV over 1 hour.
Hypomagnesemia (severe): Up to 8-12 g IV over 24 hours.
Torsades de Pointes: 1-2 g IV over 5-20 min, may repeat once.
Acute Asthma (severe): 2 g IV over 20 min.
đŸ‘ļ

Pediatric Dosing

Neonatal: Hypomagnesemia: 25-50 mg/kg/dose IV over 1-2 hours, repeat q8-12h for 2-3 doses. Max 2000 mg/day.
Infant: Hypomagnesemia: 25-50 mg/kg/dose IV over 1-2 hours, repeat q8-12h for 2-3 doses. Max 2000 mg/day.
Child: Hypomagnesemia: 25-50 mg/kg/dose IV over 1-2 hours, repeat q8-12h for 2-3 doses. Max 2000 mg/day. Acute Asthma: 25-50 mg/kg IV over 15-30 min (max 2 g).
Adolescent: Hypomagnesemia: 25-50 mg/kg/dose IV over 1-2 hours, repeat q8-12h for 2-3 doses. Max 2000 mg/day. Acute Asthma: 2 g IV over 20 min.
âš•ī¸

Dose Adjustments

Renal Impairment:

Mild: Monitor magnesium levels closely. May require dose reduction.
Moderate: Significant dose reduction required (e.g., 50% or more). Monitor magnesium levels, DTRs, and urine output frequently.
Severe: Contraindicated or extreme caution with significant dose reduction. Monitor magnesium levels, DTRs, and urine output frequently. Risk of toxicity is high.
Dialysis: Generally contraindicated unless under strict monitoring and for specific indications (e.g., severe hypomagnesemia). Magnesium is dialyzable.

Hepatic Impairment:

Mild: No specific dose adjustment required.
Moderate: No specific dose adjustment required.
Severe: No specific dose adjustment required.

Pharmacology

đŸ”Ŧ

Mechanism of Action

Magnesium is an essential cofactor for numerous enzyme systems, including those involved in ATP production, nucleic acid synthesis, and muscle contraction. It acts as a physiological calcium channel blocker, reducing acetylcholine release at the neuromuscular junction, depressing central nervous system (CNS) activity, and causing peripheral vasodilation. In preeclampsia/eclampsia, it stabilizes neuronal membranes, preventing seizures. In asthma, it relaxes bronchial smooth muscle by inhibiting calcium influx.
📊

Pharmacokinetics

Absorption:

Bioavailability: 100% (IV)
Tmax: Immediate (IV)
FoodEffect: Not applicable (IV)

Distribution:

Vd: 0.2-0.3 L/kg
ProteinBinding: Approximately 30% (to albumin)
CnssPenetration: Limited (crosses blood-brain barrier slowly, but therapeutic levels can affect CNS)

Elimination:

HalfLife: Approximately 4 hours (normal renal function), significantly prolonged in renal impairment.
Clearance: Primarily renal clearance, proportional to glomerular filtration rate (GFR).
ExcretionRoute: Renal (urine)
Unchanged: Nearly 100%
âąī¸

Pharmacodynamics

OnsetOfAction: Immediate (IV)
PeakEffect: Minutes (IV)
DurationOfAction: Approximately 30 minutes (single IV bolus), sustained with continuous infusion.

Safety & Warnings

âš ī¸

BLACK BOX WARNING

Continuous administration of magnesium sulfate to pregnant women for more than 5-7 days can result in hypocalcemia and bone abnormalities in the developing fetus. Magnesium sulfate should be administered for short-term tocolysis only when the benefits outweigh the risks.
âš ī¸

Side Effects

Urgent Side Effects: Seek Medical Help Right Away

While rare, some people may experience severe and potentially life-threatening side effects when taking this medication. If you notice any of the following symptoms, contact your doctor or seek medical attention immediately:

Signs of an allergic reaction, such as:
+ Rash
+ Hives
+ Itching
+ Red, swollen, blistered, or peeling skin with or without fever
+ Wheezing
+ Tightness in the chest or throat
+ Trouble breathing, swallowing, or talking
+ Unusual hoarseness
+ Swelling of the mouth, face, lips, tongue, or throat
Signs of high magnesium levels, including:
+ Confusion
+ Feeling sluggish
+ Slow movements
+ Shortness of breath
+ Upset stomach
+ Severe dizziness or passing out
Signs of low calcium levels, such as:
+ Muscle cramps or spasms
+ Numbness and tingling
+ Seizures
Other severe side effects, including:
+ Slow heartbeat
+ Flushing
+ Inability to move
+ Changes in eyesight
+ Feeling cold
+ Excessive sweating

If you experience any of the following symptoms, call your doctor right away, as they could be signs of a life-threatening muscle problem:
New or worsening muscle weakness
Trouble chewing or swallowing
Trouble breathing
Droopy eyelids
* Changes in eyesight, such as blurred vision or double vision

Other Possible Side Effects

Like all medications, this drug can cause side effects. While many people may not experience any side effects or only minor ones, it's essential to contact your doctor or seek medical help if you have any side effects that bother you or do not go away. Not all possible side effects are listed here. If you have questions or concerns about side effects, consult your doctor.

You can report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch. Your doctor can also provide medical advice about side effects.
🚨

Seek Immediate Medical Attention If You Experience:

  • Difficulty breathing or slow breathing
  • Extreme drowsiness or confusion
  • Severe muscle weakness or inability to move
  • Absent reflexes (e.g., knee jerk)
  • Dizziness or lightheadedness (sign of low blood pressure)
  • Blurred or double vision
  • Slurred speech
📋

Before Using This Medicine

Before Taking This Medication: Important Information to Share with Your Doctor

It is essential to inform your doctor about the following:

Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Be sure to describe the allergic reaction you experienced, including any symptoms that occurred.
If you have a heart block or any pre-existing heart problems.
* If you are currently taking nifedipine or terbutaline, as these medications may interact with this drug.

Please note that this is not an exhaustive list of potential interactions. To ensure your safety, it is crucial to disclose all of your medications, including prescription and over-the-counter drugs, natural products, and vitamins, as well as any health problems you may have. Your doctor and pharmacist need this information to determine whether it is safe for you to take this medication in conjunction with your other treatments.

Remember, do not start, stop, or modify the dosage of any medication without first consulting your doctor to confirm that it is safe to do so.
âš ī¸

Precautions & Cautions

It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication. If you are following a low-magnesium diet, consult with your doctor to discuss any potential interactions.

Regular blood tests will be necessary, as directed by your doctor, to monitor your condition. Be sure to follow your doctor's instructions for scheduling these tests and discuss any concerns or questions you may have.

This medication may contain aluminum, which can increase the risk of aluminum toxicity with long-term use. This risk is particularly higher if you have kidney problems or if you are a premature infant. It is crucial to discuss this potential risk with your doctor.

Do not take this medication if you have myasthenia gravis, as it can cause severe and potentially life-threatening breathing problems in people with this condition.

If you are pregnant or become pregnant while taking this medication, you should contact your doctor immediately, as it may harm the unborn baby.

If you are breastfeeding, inform your doctor, as you will need to discuss the potential risks to your baby and determine the best course of action.
🆘

Overdose Information

Overdose Symptoms:

  • Hypotension (low blood pressure)
  • Nausea, vomiting
  • Flushing, sweating
  • CNS depression (drowsiness, confusion, coma)
  • Respiratory depression (slow, shallow breathing, apnea)
  • Loss of deep tendon reflexes
  • Muscle weakness, paralysis
  • Bradycardia (slow heart rate)
  • Cardiac arrest

What to Do:

Immediate discontinuation of magnesium sulfate. Administer intravenous calcium gluconate (10 mL of 10% solution) slowly to counteract magnesium's effects. Provide respiratory support (e.g., mechanical ventilation) if needed. IV fluids to promote renal excretion. Dialysis may be considered in severe cases with renal failure. Call 1-800-222-1222 (Poison Control) for further guidance.

Drug Interactions

đŸšĢ

Contraindicated Interactions

  • Calcium channel blockers (e.g., nifedipine, verapamil, diltiazem) - increased risk of hypotension and neuromuscular blockade.
  • Neuromuscular blocking agents (e.g., succinylcholine, rocuronium, vecuronium) - potentiates and prolongs neuromuscular blockade.
🔴

Major Interactions

  • CNS depressants (e.g., opioids, benzodiazepines, barbiturates, general anesthetics) - additive CNS depression, respiratory depression.
  • Digoxin - increased risk of cardiac conduction abnormalities (though magnesium can be used to treat digoxin-induced arrhythmias).
🟡

Moderate Interactions

  • Diuretics (loop and thiazide) - may increase renal excretion of magnesium, potentially leading to hypomagnesemia (if not the reason for administration).
  • Aminoglycosides - may potentiate neuromuscular blockade.
đŸŸĸ

Minor Interactions

  • Not available

Monitoring

đŸ”Ŧ

Baseline Monitoring

Serum Magnesium Level

Rationale: To establish baseline and guide initial dosing, especially in hypomagnesemia or renal impairment.

Timing: Prior to initiation of therapy.

Renal Function (BUN, Creatinine)

Rationale: Magnesium is renally excreted; impaired renal function increases risk of toxicity.

Timing: Prior to initiation of therapy.

Blood Pressure

Rationale: Magnesium can cause hypotension.

Timing: Prior to initiation of therapy.

Respiratory Rate

Rationale: High magnesium levels can cause respiratory depression.

Timing: Prior to initiation of therapy.

Deep Tendon Reflexes (DTRs)

Rationale: Loss of DTRs is an early sign of magnesium toxicity.

Timing: Prior to initiation of therapy.

📊

Routine Monitoring

Serum Magnesium Level

Frequency: Every 4-6 hours during continuous infusion, or as clinically indicated.

Target: 4-7 mg/dL (therapeutic for eclampsia); 1.5-2.5 mg/dL (normal range)

Action Threshold: >7 mg/dL (toxicity risk), >12 mg/dL (respiratory depression), >15 mg/dL (cardiac arrest)

Blood Pressure

Frequency: Every 15-30 minutes during loading dose, then hourly during maintenance infusion.

Target: Individualized, maintain adequate perfusion.

Action Threshold: Significant hypotension (e.g., SBP <90 mmHg or symptomatic hypotension)

Respiratory Rate

Frequency: Every 15-30 minutes during loading dose, then hourly during maintenance infusion.

Target: >12 breaths/min

Action Threshold: <12 breaths/min (sign of toxicity)

Deep Tendon Reflexes (DTRs)

Frequency: Every 15-30 minutes during loading dose, then hourly during maintenance infusion.

Target: Present (e.g., 1+ or 2+)

Action Threshold: Absent patellar reflexes (sign of toxicity)

Urine Output

Frequency: Hourly

Target: >25-30 mL/hour

Action Threshold: <25 mL/hour (indicates impaired renal excretion and increased toxicity risk)

ECG

Frequency: Consider with rapid infusion or high doses, or in patients with cardiac disease.

Target: Normal rhythm, PR/QRS/QT intervals

Action Threshold: Prolonged PR, QRS, QT intervals; heart block; bradycardia

đŸ‘ī¸

Symptom Monitoring

  • Flushing
  • Sweating
  • Drowsiness
  • Muscle weakness
  • Slurred speech
  • Blurred vision
  • Hypotension
  • Respiratory depression
  • Loss of deep tendon reflexes
  • Cardiac arrhythmias

Special Patient Groups

🤰

Pregnancy

Category D. Used for prevention and treatment of seizures in preeclampsia and eclampsia. Prolonged use (more than 5-7 days) for preterm labor has been associated with fetal bone abnormalities (hypocalcemia, osteopenia) and should be avoided unless benefits clearly outweigh risks. Short-term use for neuroprotection in preterm labor is common.

Trimester-Specific Risks:

First Trimester: Limited data, generally not used.
Second Trimester: Used for preeclampsia/eclampsia if indicated.
Third Trimester: Commonly used for preeclampsia/eclampsia and neuroprotection in preterm labor. Risk of fetal bone abnormalities with prolonged exposure.
🤱

Lactation

Magnesium is naturally present in breast milk. Excretion into breast milk is minimal and unlikely to cause adverse effects in a healthy, full-term infant. Considered compatible with breastfeeding when used therapeutically.

Infant Risk: Low risk for healthy, full-term infants. Monitor for signs of sedation or diarrhea in the infant, especially with high maternal doses.
đŸ‘ļ

Pediatric Use

Dosing is weight-based. Close monitoring of magnesium levels, vital signs, and reflexes is crucial due to varying renal function and sensitivity. Used for hypomagnesemia, severe acute asthma, and sometimes for specific cardiac arrhythmias.

👴

Geriatric Use

Use with caution due to potential for age-related decline in renal function, which increases the risk of magnesium toxicity. Start with lower doses and monitor closely for signs of toxicity (e.g., hypotension, respiratory depression, CNS depression, loss of reflexes).

Clinical Information

💎

Clinical Pearls

  • Always have calcium gluconate (10% solution) readily available as an antidote for magnesium toxicity.
  • Closely monitor deep tendon reflexes, respiratory rate, blood pressure, and urine output as these are key indicators of magnesium toxicity.
  • Magnesium sulfate is a high-alert medication; ensure correct dose, concentration, and infusion rate.
  • In patients with renal impairment, significant dose reduction is necessary to prevent accumulation and toxicity.
  • For eclampsia, the goal is to maintain therapeutic magnesium levels (4-7 mg/dL) to prevent seizures, not necessarily to normalize blood pressure.
  • IV magnesium should always be administered via infusion pump, never as a rapid IV push (except for specific emergency situations like Torsades de Pointes).
🔄

Alternative Therapies

  • For eclampsia/preeclampsia: Antihypertensives (e.g., labetalol, hydralazine) for blood pressure control, but magnesium is specific for seizure prevention.
  • For hypomagnesemia: Oral magnesium supplements (for mild cases).
  • For acute asthma: Beta-agonists, corticosteroids, anticholinergics.
  • For Torsades de Pointes: Electrical cardioversion, isoproterenol, overdrive pacing.
💰

Cost & Coverage

Average Cost: Varies widely, typically low cost for generic IV solution. per 50ml vial
Generic Available: Yes
Insurance Coverage: Tier 1 (Generic)
📚

General Drug Facts

If your symptoms or health problems do not improve or worsen over time, it is essential to contact your doctor for further evaluation and guidance. To ensure safe use, never share your medication with others, and do not take medication prescribed to someone else. Store all medications in a secure location, out of reach of children and pets, to prevent accidental ingestion. Properly dispose of unused or expired medications by throwing them away. However, do not flush them down the toilet or pour them down the drain unless specifically instructed to do so by a healthcare professional or pharmacist. If you are unsure about the best method for disposing of medications, consult with your pharmacist, as they may be aware of drug take-back programs in your area. Additionally, some medications may come with a separate patient information leaflet, which can be obtained by consulting with your pharmacist. If you have any questions or concerns about your medication, it is crucial to discuss them with your doctor, nurse, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek emergency medical attention. Be prepared to provide information about the medication taken, the amount, and the time it was taken, as this will aid in providing appropriate treatment.