Metamizole Sodium Tablets

Metamizole Sodium Tablets, is a nonsteroidal anti-inflammatory drug (NSAID) that exhibits analgesic, andantipyretic activities.
Metamizole Sodium is readily completely absorbed from the gastrointestinal tract with peak plasmaconcentrations occurring about 10 to 60 minutes after oral administration.Food has no significant effecton the extent of Metamizole Sodium absorption.The drug is distributed into most body tissues.It crossesthe placenta and is present in breast milk.
Plasma-protein binding is negligible at usual therapeutic concentrations but increases with increasingconcentrations.

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APIS

Active Pharmaceutical Ingredient	Latin Name	Molecular Formula	Defination	Structural Formula
Metamizole Sodium Tablets	Metamizole Sodium Tabulettae	C13H18N3NaO5S	-Phenyl-2,3-dimethyl-5-pyrazolone-4-methylaminomethanesulfonate Sodium Monohydrate

The elimination half-life of Metamizole Sodium varies from about 1 to 3 hours.Approximately65% of thedose is excreted in the urine and approximately 35% in the bile as conjugates of unchanged MetamizoleSodium plus metabolites.

Because renal elimination is not a significant pathway of elimination for unchanged Metamizole Sodium,dosing adjustment in patients with mild to moderaterenaldysfunction is not necessary.

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Indications

Metamizole Sodium Tablet Pharmacotherapeutic Guidelines

Pharmacological Indications
Indicated for acute pain syndromes of diverse etiology including:

Odontogenic pain

Cephalalgia (NSAID-resistant migraine)

Musculoskeletal disorders (myalgia/arthralgia Grade I-II)

Neuropathic pain syndromes

Pyrexia refractory to first-line antipyretics

Dosage Protocol
Oral Administration:

Adult regimen:
500 mg (½-1 tablet) TID-QID
Max cumulative dose: 3000 mg/24h
Administration timing: Postprandial

Adolescent protocol (≥15 y/o):
250 mg BID-TID

Risk Mitigation Strategies

Hypersensitivity Monitoring

Contraindicated in patients with:

History of analgesic-induced anaphylaxis

NSAID-exacerbated respiratory disease (NERD)

Atopic predisposition (IgE >150 IU/mL)

Hemodynamic Precautions

Absolute contraindication for parenteral use in:

Hypotension (SBP <90 mmHg)

Autonomic dysfunction

Mandatory monitoring parameters if administered:

Continuous BP measurement

ECG telemetry (QTc interval assessment)

Hematological Surveillance

Required for chronic therapy (>5 days):

Complete blood count weekly

Differential leukocyte count q72h

Neurocognitive Advisory

Dose-related CNS effects:

Impaired vigilance (≥2000 mg/day)

Delayed reaction time (≥2500 mg/day)

Prohibited activities during treatment:

Heavy machinery operation

Precision instrument handling

Clinical Decision Pathway

Parameter	Action Threshold	Intervention
Neutrophil count	<1.5×10⁹/L	Immediate discontinuation
Systolic BP	Δ >20% baseline	Fluid challenge + vasopressors
Cutaneous reactions	Any urticarial lesion	Antihistamine + corticosteroid

Adverse Effects

The most serious Metamizole Sodium Tablets side effect is on the bone marrow (agranulocytosis, thrombocytopenia).This adverse effect occurs on the second or repeated exposure to the drug due to the formation ofantibodies against it.Prolonged use may proveto be toxicto thekidneys.

Other adverse effects: irritation of the stomach, skin rashes and asthma, due to allergy.Metamizoleoccasionally causes constipation, drowsiness and dizziness.Children are more susceptible to its adverseeffects and it should be avoided in children below one year of age.

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