Neiraxin (Thiamine Hydrochloride, Cyanocobalamin, Pyridoxine Hydrochloride, Lidocaine Hydrochloride)

Neiraxin combines vitamin B nutrients and a local anesthetic, and is used in the following clinical contexts:

• Vitamin B1 (thiamine) deficiency: supports metabolic function and prevents beriberi in at‑risk patients.
• Vitamin B12 (cobalamin) deficiency: aids in hematologic and neurologic recovery in patients with pernicious anemia.
• Vitamin B6 (pyridoxine) deficiency: assists in amino‑acid metabolism and reduces neuropathic symptoms.
• Peri‑procedural analgesia: provides local anesthesia for minor surgical or diagnostic intramuscular procedures.

• The thiamine, cyanocobalamin and pyridoxine components act as essential co‑enzymes in carbohydrate metabolism, DNA synthesis and neurotransmitter production, respectively, restoring normal cellular function in deficiency states. Lidocaine hydrochloride blocks voltage‑gated sodium channels in neuronal membranes, inhibiting impulse conduction and producing reversible local anesthesia at the injection site.

Neiraxin may be associated with a range of adverse reactions following intramuscular administration.

Common Side Effects

• Injection site pain or erythema
• Mild nausea or vomiting
• Headache or dizziness
• Transient tingling or numbness around the injection area
• Mild flushing or warmth sensation
• Temporary increase in heart rate

Serious or Rare Side Effects

• Allergic reaction including rash, urticaria, or angioedema
• Anaphylaxis or severe bronchospasm
• Cardiovascular collapse or severe hypotension
• Cardiac arrhythmias due to lidocaine toxicity
• Stevens‑Johnson syndrome or toxic epidermal necrolysis
• Seizures or central nervous system depression

When considering Neiraxin, clinicians should observe the following precautions:

• Assess vitamin deficiency status: confirm need for B‑vitamin supplementation before administration.
• Allergy screening: avoid use in patients with known hypersensitivity to any component, especially lidocaine.
• Hepatic function: use cautiously in patients with severe liver impairment due to lidocaine metabolism.
• Renal function: monitor closely in renal insufficiency as vitamin metabolites may accumulate.
• Concomitant sodium channel blockers: evaluate risk of additive local‑anesthetic toxicity.
• Store at ambient temperature: keep in original container, protect from moisture and direct sunlight.

Neiraxin can interact with other medicines; awareness of the following categories is recommended.

Major Interactions (Avoid)

• Other local anesthetics or sodium‑channel blockers: risk of cumulative neuro‑cardiac toxicity.
• Monoamine oxidase inhibitors (MAOIs): may potentiate lidocaine‑related cardiac effects.
• High‑dose vitamin B supplements: increase risk of hypervitaminosis and related toxicity.

Moderate Interactions (Monitor Closely)

• Antihypertensive agents: lidocaine may enhance hypotensive effects.
• Diuretics: may alter electrolyte balance affecting lidocaine activity.
• Anticoagulants: monitor for bleeding at injection site due to vitamin K‑dependent pathways.