1. Clinical Overview
Tolperisone is a centrally acting muscle relaxant used primarily for the symptomatic treatment of spasticity and muscle spasms associated with various neurological and musculoskeletal conditions. It is a piperidine derivative with a unique mechanism that differentiates it from other muscle relaxants. In the Indian context, it is widely prescribed for conditions like cervical spondylosis, low back pain, and post-stroke spasticity.
| Onset | Duration | Bioavailability |
|---|---|---|
| 1-2 hours | 4-6 hours | Approximately 20% (due to significant first-pass metabolism) |
2. Mechanism of Action
Tolperisone exerts its spasmolytic effect through multiple mechanisms. Its primary action is the blockade of voltage-gated sodium channels in the membranes of peripheral nerve fibers (both motor and sensory), leading to a reduction in the frequency and amplitude of action potentials. This stabilizes nerve membranes and reduces excessive neuronal firing that causes muscle spasticity and pain.
3. Indications & Uses
- Symptomatic treatment of spasticity due to neurological disorders (e.g., stroke, multiple sclerosis, cerebral palsy)
- Muscle spasms associated with painful musculoskeletal conditions (e.g., cervical spondylosis, low back pain, lumbago)
4. Dosage & Administration
Adult Dosage: 50-150 mg three times daily (tid). The usual starting dose is 50 mg tid, which can be increased to 100 mg tid or 150 mg tid based on response and tolerability.
Administration: To be taken orally with or after food to minimize gastrointestinal discomfort. Tablets should be swallowed whole with a glass of water. Do not crush or chew.
5. Side Effects
Common side effects may include:
- Nausea
- Abdominal discomfort/pain
- Dyspepsia
- Headache
- Drowsiness/sedation
- Dizziness
- Weakness/fatigue
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| CYP2D6 Inhibitors (e.g., Fluoxetine, Paroxetine, Quinidine) | Increased tolperisone plasma levels, risk of toxicity (CNS depression, hypotension). | Major |
| CYP2C19 Inhibitors (e.g., Omeprazole, Fluconazole) | Potential increase in tolperisone levels. | Moderate |
| Other CNS Depressants (e.g., Alcohol, Benzodiazepines, Opioids, Baclofen) | Additive sedative effects, impaired alertness and coordination. | Major |
| Antihypertensives | Potentiated hypotensive effect. | Moderate |
| Levodopa | Theoretical antagonism of effect; use with caution in Parkinsonism. | Moderate |
7. Patient Counselling
- Do take the medicine exactly as prescribed by your doctor.
- Do take it with food if you experience stomach upset.
- Do not stop the medicine abruptly if taken for a long time; consult your doctor.
- Do not crush or chew the tablet.
- Do not take a double dose to make up for a missed one.
8. Toxicology & Storage
Overdose: Symptoms may include severe CNS depression (coma, respiratory depression), profound hypotension, tachycardia, convulsions, nausea, and vomiting.
Storage: Store below 30°C. Protect from light and moisture. Keep out of reach of children.