Marcain Spinal Tung (Bupivacaine Hydrochloride)

• Bupivacaine hydrochloride is a long‑acting amide local anesthetic used in regional and spinal anesthesia.
• Surgical anesthesia: provides dense sensory block for operative procedures.
• Regional anesthesia: enables nerve block for limb or trunk surgeries.
• Spinal anesthesia: produces rapid and profound analgesia for lower‑body operations.
• Postoperative analgesia: extends pain relief after surgery, reducing the need for systemic opioids.

• Bupivacaine hydrochloride blocks voltage‑gated sodium channels on neuronal membranes, preventing the initiation and propagation of action potentials. By stabilising the neuronal membrane, it inhibits nerve impulse transmission, resulting in reversible loss of sensation and motor function in the targeted area. The drug’s high lipid solubility contributes to its prolonged duration of action compared with shorter‑acting local anesthetics.

Adverse reactions may occur following administration of bupivacaine.

Common Side Effects

• Hypotension: reduced blood pressure after spinal block.
• Bradycardia: slower heart rate during or after injection.
• Nausea: mild to moderate upset stomach.
• Dizziness: feeling light‑headed or unsteady.
• Metallic taste: transient taste disturbance.
• Headache: post‑dural puncture headache.

Serious or Rare Side Effects

• Cardiac arrest: severe cardiotoxicity, especially with high plasma levels.
• Seizures: central nervous system excitation due to high concentrations.
• Respiratory depression: inadequate breathing requiring support.
• Allergic reaction: rash, itching, or anaphylaxis.
• Prolonged motor block: extended loss of muscle function.
• Methemoglobinemia: rare blood disorder causing reduced oxygen delivery.

• When using Marcain Spinal Tung, clinicians should observe several safety measures.
• Allergy assessment: verify no known hypersensitivity to amide‑type local anesthetics.
• Dose calculation: adjust dose based on patient weight, age, and comorbidities.
• Cardiovascular monitoring: continuously observe heart rate and blood pressure during administration.
• Neurological assessment: watch for signs of spinal cord irritation or excessive block.
• Use with caution in hepatic impairment: reduced metabolism may prolong drug effect.
• Store below 25°C: keep in the original pack, protect from moisture and light.

Bupivacaine may interact with other medicines, requiring careful management.

Major Interactions (Avoid)

• Class I antiarrhythmics (e.g., quinidine): increase risk of cardiotoxicity.
• Beta‑blockers: may potentiate bradycardia and hypotension.
• General anesthetics (e.g., halothane): additive central nervous system depression.

Moderate Interactions (Monitor Closely)

• Opioids: enhance respiratory depression when combined.
• Sedatives (e.g., benzodiazepines): increase risk of excessive CNS depression.
• Lithium: may heighten neurotoxic effects of bupivacaine.