Nodex Adultes (Dextromethorphan Hydrobromide)

Dextromethorphan acts as a centrally acting cough suppressant and is used for cough relief in various respiratory conditions.

• Non‑productive cough: reduces cough frequency and severity in adults.
• Cough associated with common cold: provides symptomatic relief during viral upper respiratory infections.
• Cough due to bronchitis: helps alleviate persistent dry cough in acute bronchitis.

• Dextromethorphan exerts its antitussive effect by antagonizing NMDA receptors and modulating sigma‑1 receptors in the medullary cough center, thereby raising the cough threshold. This central action reduces the reflexive cough response without affecting respiratory drive.

Dextromethorphan is generally well tolerated, but several adverse reactions have been reported.

Common Side Effects

• Dizziness: mild vertigo or light‑headedness.
• Nausea: occasional stomach upset.
• Drowsiness: increased sleepiness.
• Constipation: reduced bowel movements.
• Dry mouth: decreased salivation.
• Mild gastrointestinal upset: abdominal discomfort.

Serious or Rare Side Effects

• Allergic reactions: rash, itching, or angioedema.
• Serotonin syndrome: agitation, hyperthermia, or muscle rigidity when combined with serotonergic agents.
• Respiratory depression: severe suppression of breathing at high doses.
• Hallucinations or psychotic symptoms: visual or auditory disturbances.
• Seizures: rare convulsive episodes.
• Severe skin reactions: Stevens‑Johnson syndrome or toxic epidermal necrolysis.

When using Nodex Adultes, consider the following safety measures.

• Pregnancy: consult a healthcare professional; safety data are limited.
• Breastfeeding: discuss potential risks with a physician.
• Pre‑existing respiratory disorders: use with caution in asthma or COPD.
• Concurrent MAOI therapy: avoid due to risk of serotonin syndrome.
• Alcohol or CNS depressants: may enhance drowsiness and impair coordination.
• Store at ambient temperature: keep below 25°C, retain in original packaging, and protect from moisture.

Dextromethorphan may interact with several drug classes; monitoring is advised.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): risk of severe serotonin syndrome.
• Selective serotonin reuptake inhibitors (SSRIs): increased serotonin toxicity.
• Tricyclic antidepressants: heightened serotonergic effects.
• Other serotonergic agents: potential for serotonin syndrome.

Moderate Interactions (Monitor Closely)

• CYP2D6 inhibitors (e.g., quinidine, fluoxetine): may raise dextromethorphan plasma levels.
• Alcohol: additive central nervous system depression.
• Other CNS depressants (opioids, antihistamines): may increase drowsiness and impair psychomotor performance.