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Metonitazene is a synthetic opioid analgesic that belongs to the benzenoid group. It was initially developed in the 1950s as an orally active agent for the treatment of moderate to severe pain. Metonitazene exhibits similar pharmacological properties to other opioids, such as morphine, but it also has its own unique characteristics.

Mechanism of Action

Metonitazene binds to opioid receptors in the brain and spinal cord, where it elicits its analgesic effects. By acting on these receptors, it decreases the perception of pain and increases tolerance levels. In addition to its analgesic properties, metonitazene also exhibits sedative and respiratory depressant effects.

Medical Uses

Metonitazene is primarily used as a short-term treatment for moderate to severe pain. It is commonly used after surgery, during dental procedures, and in palliative care for patients living with terminal illness. The medication is typically administered orally in tablet or liquid form, allowing patients to self-administer as needed.

Side Effects

Metonitazene is associated with a range of side effects, including:

1. Drowsiness: One of the most common side effects associated with metonitazene is drowsiness. Patients may experience difficulty concentrating, impaired coordination, and impaired judgment.

2. Nausea and Vomiting: Metonitazene can cause nausea and vomiting, particularly in higher doses. Patients may need to take antiemetic medications to prevent or manage these symptoms.

3. Constipation: Metonitazene can slow down the movement of food through the digestive system, leading to constipation. Patients may need to drink plenty of fluids and take laxatives to alleviate constipation.

4. Respiratory Depression: Metonitazene can depress the respiratory system, leading to shallow breathing and reduced oxygen intake. Patients should be closely monitored for signs of respiratory depression, such as shortness of breath, bluish discoloration of the skin, and slowed heart rate.

5. Addiction and Tolerance: Metonitazene can be habit-forming and can lead to the development of tolerance, where higher doses are needed to achieve the same effect. Patients should be monitored for signs of addiction and counseled on proper use to prevent abuse.

Dosage and Administration

The dosage of metonitazene should be individualized based on the patient’s body weight, pain intensity, and tolerance levels. It is recommended to start with a low dose and increase gradually as needed. The medication should be taken exactly as prescribed by healthcare professionals and not taken more frequently or in larger quantities than instructed.

Contraindications and Precautions

Metonitazene should not be used in individuals with severe respiratory depression, severe liver disease, or known hypersensitivity to the drug. It should be used with caution in individuals with respiratory impairment, gastrointestinal obstruction, or chronic constipation. Metonitazene should also not be combined with alcohol or other central nervous system depressants as it can increase the risk of respiratory depression.


Metonitazene is a synthetic opioid analgesic that is useful in the treatment of moderate to severe pain. While it has analgesic properties, it also comes with a range of side effects and should be used with caution. Healthcare professionals should carefully assess each individual patient’s condition before prescribing metonitazene and consider alternative therapies when necessary.

Additional information


10 Gram, 25 Grams, 50 Grams, 100 Grams, 250 Grams, 500 Grams, 1000 Gram


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