Nervius (Pramipexole Dihydrochloride Monohydrate)

• Pramipexole is a dopamine agonist used in movement‑disorder therapy.
• Parkinson's disease: improves motor control and reduces rigidity and bradykinesia.
• Restless legs syndrome: lessens leg discomfort and the urge to move during rest.
• Parkinson's disease with motor fluctuations: decreases "off" periods and enhances overall daily functioning.

• Pramipexole acts as a selective agonist at dopamine D2 and D3 receptors in the central nervous system. By binding to these receptors, it mimics dopamine’s action, enhancing dopaminergic neurotransmission in basal ganglia circuits that regulate motor activity. This stimulation compensates for the dopamine deficiency characteristic of Parkinson’s disease and modulates sensory pathways implicated in restless legs syndrome, thereby improving motor symptoms and reducing uncomfortable sensations.

Pramipexole may cause a range of adverse reactions, which are grouped by frequency and severity.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Dizziness: sensation of light‑headedness, especially on standing.
• Somnolence: increased sleepiness or fatigue.
• Constipation: reduced bowel movements.

Serious or Rare Side Effects

• Hallucinations: visual or auditory disturbances that may require medical attention.
• Impulse control disorders: compulsive gambling, shopping, or hypersexuality.
• Severe hypotension: marked drop in blood pressure leading to fainting.

When prescribing pramipexole, several precautions should be observed to ensure safe use.

• Renal function: dose adjustment is required in patients with severe renal impairment.
• Elderly patients: monitor for orthostatic hypotension and increased sedation.
• Psychiatric history: watch for emergence of hallucinations or impulse control issues.
• Concomitant MAO‑B inhibitors: avoid combined use due to risk of excessive dopaminergic stimulation.
• Pregnancy and lactation: use only if potential benefit justifies potential risk to fetus or infant.
• Store at ambient temperature: keep in original container, protect from moisture and light.

Pramipexole can interact with other medicines, affecting its efficacy or safety.

Major Interactions (Avoid)

• Antipsychotics (e.g., haloperidol): may antagonize pramipexole’s effect.
• Strong CYP2D6 inhibitors (e.g., quinidine): increase pramipexole plasma concentrations.

Moderate Interactions (Monitor Closely)

• Antihypertensives: additive hypotensive effect may require blood pressure monitoring.
• Other dopamine agonists: combined use can heighten risk of side effects such as nausea or impulse control disorders.
• SSRIs or SNRIs: may increase the likelihood of impulse control problems.