Metamizole / Dipyrone

Generic name: Metamizole / Dipyrone / Metamizole sodium

Category: Non-opioid analgesic, antipyretic, spasmolytic; pyrazolone derivative

Common brand names: Novalgin, Novaminsulfon, Nolotil, Analgin, Baralgin. Brand availability and legal status vary widely by country.

This article is for dental education only. Metamizole is not available or not approved in some countries and is prescription-only in many places where it is used. It can cause rare but serious blood disorders, especially agranulocytosis, which may lead to severe infection and can be life-threatening. Use must follow local regulations, product information, and professional judgment.

Metamizole, also called dipyrone, is a strong non-opioid analgesic used in some countries for severe pain and high fever when other measures are not sufficient or not appropriate.

In dental practice, it may be considered for moderate to severe dental pain or postoperative pain when standard options such as ibuprofen or paracetamol are unsuitable, insufficient, or contraindicated, depending on local prescribing rules.

The most important safety point is recognizing possible agranulocytosis: fever, sore throat, mouth ulcers, painful swallowing, chills, or signs of infection during or shortly after treatment require immediate medical assessment and blood count testing.

• Best use: selected severe dental pain when safer first-line options are unsuitable or insufficient
• Common dental context: severe postoperative pain, inflammatory pain, pain when NSAIDs are contraindicated
• Main advantage: strong analgesic effect without typical NSAID stomach or platelet effects
• Main risk: agranulocytosis, severe allergy, severe skin reaction, hypotension
• Clinical priority: give clear infection-warning instructions and avoid masking symptoms

• Selected moderate to severe dental pain when first-line analgesics are unsuitable or insufficient
• Postoperative dental or oral surgical pain when prescribed according to local rules
• Pain control in patients where NSAIDs are risky, such as selected patients with ulcer risk, bleeding risk, or renal/cardiovascular concerns, only after proper evaluation
• Short-term bridge analgesia while definitive dental treatment or follow-up is arranged
• Fever reduction only when clinically appropriate, while remembering that fever can be an infection warning sign

Example only: Metamizole 500–1,000 mg orally up to four times daily as needed for short-term severe pain, where this medication is approved and appropriate.

A commonly referenced adult maximum is 4,000 mg per day, but exact dosing depends on local product information, formulation, age, weight, renal/hepatic status, and clinician judgment.

Use the lowest effective dose for the shortest necessary time. The patient must receive clear instructions to stop the drug and seek urgent medical care if fever, sore throat, mouth ulcers, or infection signs appear.

• Known hypersensitivity to metamizole, other pyrazolones, or pyrazolidines
• Previous agranulocytosis or serious blood reaction linked to metamizole or related drugs
• Bone marrow dysfunction or significant blood cell formation disorder
• History of analgesic-induced asthma, urticaria, angioedema, or severe allergic reaction
• Severe hepatic or renal impairment without medical approval
• Acute intermittent hepatic porphyria in many product labels
• Glucose-6-phosphate dehydrogenase deficiency in many product labels because of hemolysis risk
• Late pregnancy, especially the third trimester
• Use in countries where the drug is not approved or outside local legal prescribing rules

• Agranulocytosis: a sudden dangerous drop in granulocytes can cause severe infection and may be life-threatening.
• Masked infection signs: when used for fever or together with antibiotics, early signs of agranulocytosis or infection may be harder to recognize.
• Immediate action: fever, sore throat, mouth ulcers, chills, painful swallowing, or infection signs require stopping the drug and urgent blood count testing.
• Severe allergic reactions: bronchospasm, angioedema, hypotension, anaphylaxis, or shock can occur.
• Severe skin reactions: blistering, mucosal lesions, skin peeling, or widespread rash require urgent medical care.
• Hypotension: blood pressure may drop, especially with injections, rapid administration, high doses, fever, dehydration, or unstable circulation.
• Pregnancy and breastfeeding: use only according to local product information and medical advice.

In dentistry, metamizole requires very clear patient instructions because the mouth can show early warning signs. New sore throat, mouth ulcers, fever, chills, painful swallowing, or unusual infection symptoms during or shortly after treatment are not “normal dental healing” and need urgent medical assessment.

• Methotrexate: blood toxicity risk may increase, especially in older patients or higher-risk patients.
• Clozapine or other marrow-suppressing drugs: may increase the risk of serious blood disorders.
• Antibiotics: may mask fever or infection symptoms that could warn of agranulocytosis.
• Ciclosporin: metamizole may reduce ciclosporin levels; monitoring may be needed.
• Bupropion and some other CYP2B6/CYP3A4 substrates: levels may be reduced in some product information due to enzyme induction concerns.
• Alcohol: may increase sedation, dizziness, or adverse-effect risk in some patients.
• Other analgesics: avoid unsupervised stacking with multiple painkillers; choose a clear pain plan.

• Nausea or stomach discomfort
• Dizziness or tiredness
• Low blood pressure, especially with injections or high-risk situations
• Rash, itching, or urticaria
• Dark red urine may occur in some cases and should be assessed if concerning
• Rare but serious: agranulocytosis, pancytopenia, severe infection, anaphylaxis, severe skin reaction, shock
• Warning symptoms: fever, sore throat, mouth ulcers, chills, painful swallowing, unusual weakness, or infection signs

• Take metamizole only as prescribed and only where it is approved for use.
• Do not exceed the prescribed dose or daily maximum.
• Do not use it casually for simple toothache without dental assessment.
• Stop the medicine and seek urgent medical care if fever, sore throat, mouth ulcers, chills, painful swallowing, or infection signs occur.
• Tell the dentist or physician if you are taking antibiotics, methotrexate, clozapine, ciclosporin, or medicines affecting the immune system.
• Seek immediate help for breathing difficulty, facial swelling, throat swelling, dizziness, collapse, severe rash, or blistering.
• Contact the dentist if dental pain worsens, swelling develops, fever appears, or mouth opening becomes limited.

Metamizole may be helpful for severe dental pain in countries where it is commonly prescribed, but it needs stronger safety communication than many routine analgesics. In dentistry, mouth ulcers and sore throat are especially important because they can be mistaken for dental or postoperative problems, while they may actually signal a serious blood disorder.

• Fever, sore throat, mouth ulcers, chills, painful swallowing, or signs of infection during or shortly after treatment
• Difficulty breathing, wheezing, facial swelling, throat swelling, severe dizziness, or collapse
• Severe rash, blistering, mucosal lesions, or skin peeling
• Unusual bruising, bleeding, extreme fatigue, or signs of blood disorder
• Severe low blood pressure symptoms: fainting, cold sweat, confusion, or collapse
• Rapidly spreading dental swelling, fever, trismus, or difficulty swallowing
• Pain that does not improve or becomes worse despite correct use

• Paracetamol / Acetaminophen
• Ibuprofen
• Naproxen
• Diclofenac
• Aspirin / Acetylsalicylic acid
• Tramadol
• Codeine combinations

Metamizole/dipyrone is a strong non-opioid analgesic used in some countries for severe pain and fever. In dentistry, it may be useful for selected severe dental pain or postoperative pain when safer first-line options are unsuitable or insufficient. Its major safety concern is agranulocytosis, a rare but serious blood disorder that may present with fever, sore throat, mouth ulcers, chills, painful swallowing, or infection signs. Safe dental use requires legal awareness, careful patient selection, avoidance of risky combinations, clear warning instructions, and immediate medical referral if blood-disorder symptoms appear.