Myoperizone (Tolperisone Hydrochloride)

Tolperisone Hydrochloride is used to treat conditions involving skeletal muscle hyperexcitability.

• Muscle spasm: Reduces involuntary muscle contractions and associated pain.
• Musculoskeletal pain: Alleviates pain related to strain or injury of muscles and joints.
• Low back pain: Decreases muscle tone contributing to chronic low‑back discomfort.
• Spasticity: Improves muscle tone in patients with neurological spasticity.

• Tolperisone hydrochloride exerts its effect by blocking voltage‑gated sodium channels in the central nervous system, which dampens the generation and propagation of action potentials in motor neurons. This inhibition reduces skeletal muscle hyperexcitability and lowers muscle tone without significant anticholinergic activity, leading to relaxation of spastic or painful muscles. The drug does not significantly affect peripheral neuromuscular transmission, allowing functional motor activity to be preserved while relieving spasm.

Tolperisone hydrochloride may be associated with a range of adverse reactions, from mild, transient symptoms to rare but potentially serious events that require medical attention.

Common Side Effects

• Dizziness: transient sensation of light‑headedness, often occurring at treatment initiation.
• Nausea: occasional upset stomach, usually self‑limiting.
• Dry mouth: reduced salivation leading to throat discomfort.
• Drowsiness: mild sedation that may affect alertness.
• Headache: mild to moderate pain, often resolves without intervention.
• Gastrointestinal discomfort: mild abdominal upset or dyspepsia.

Serious or Rare Side Effects

• Severe hypotension: marked drop in blood pressure that may cause fainting.
• Allergic reactions: rash, urticaria, or angioedema requiring discontinuation.
• Hepatic dysfunction: elevated liver enzymes or jaundice indicating liver injury.
• Blood dyscrasias: neutropenia or agranulocytosis.
• Cardiac arrhythmias: irregular heart rhythm potentially requiring monitoring.
• Stevens‑Johnson syndrome: severe skin reaction with mucosal involvement.

When prescribing Tolperisone Hydrochloride, consider the following precautions.

• Renal impairment: dose adjustment may be required in patients with reduced kidney function.
• Hepatic impairment: use with caution; monitor liver function tests.
• Hypersensitivity: discontinue if signs of allergic reaction appear.
• Elderly patients: start with a lower dose due to increased sensitivity.
• Concomitant CNS depressants: may enhance sedative effects; monitor closely.
• Store at ambient temperature: keep below 25 °C, protect from moisture and light in the original packaging.

Tolperisone Hydrochloride can interact with several medicines; review patient medication lists carefully.

Major Interactions (Avoid)

• Other central muscle relaxants (e.g., baclofen, tizanidine): additive muscle weakness and sedation.
• Strong CNS depressants (benzodiazepines, opioids): increased risk of profound drowsiness and respiratory depression.

Moderate Interactions (Monitor Closely)

• Antihypertensive agents: potential additive hypotensive effect.
• Alcohol: may potentiate central nervous system depression.
• CYP450 inhibitors (e.g., erythromycin, fluconazole): possible increase in tolperisone plasma levels.
• Anticholinergic drugs: may exacerbate dry mouth.
• Diuretics: may enhance hypotensive response.