Memantina Teva (Memantine Hydrochloride)

Memantine is an NMDA‑receptor antagonist used in the management of neurodegenerative disorders, primarily Alzheimer’s disease.

• Alzheimer’s disease (moderate to severe): improves cognition, memory and daily functioning.
• Alzheimer’s disease (mild to moderate) as add‑on therapy: may provide additional cognitive benefit when combined with a cholinesterase inhibitor.
• Behavioral symptoms of Alzheimer’s disease: may reduce agitation and aggression associated with the condition.

• Memantine acts as a non‑competitive antagonist at the NMDA (N‑methyl‑D‑aspartate) receptor, binding to the receptor-associated ion channel with moderate affinity. By blocking excessive calcium influx caused by prolonged glutamate activation, it reduces excitotoxic neuronal injury while preserving normal synaptic transmission, thereby helping to maintain neuronal function in Alzheimer’s disease.

Memantina Teva may cause a range of adverse reactions.

Common Side Effects

• Dizziness: sensation of light‑headedness or unsteadiness.
• Headache: mild to moderate intensity.
• Constipation: reduced bowel movements.
• Fatigue: feeling unusually tired.
• Confusion: transient disorientation.
• Nausea: mild stomach upset.

Serious or Rare Side Effects

• Seizures: rare occurrence of convulsive episodes.
• Severe allergic reaction: rash, swelling, or difficulty breathing.
• Hallucinations: visual or auditory disturbances.
• Mood changes: depression or suicidal thoughts.
• Hyponatremia: low blood sodium levels.
• Cardiac arrhythmia: irregular heart rhythm.

Before initiating therapy, consider the following safety points.

• Renal impairment: dose may need adjustment in patients with reduced kidney function.
• Hepatic disease: monitor liver enzymes in patients with liver dysfunction.
• History of seizures: use with caution and monitor for convulsions.
• Concomitant use of other NMDA antagonists: avoid additive neuro‑psychiatric effects.
• Pregnancy and breastfeeding: safety not established; weigh potential benefits against risks.
• Store at ambient temperature: keep below 25 °C, in the original container, protected from moisture and direct sunlight.

Memantina Teva can interact with several medicines; awareness helps prevent adverse outcomes.

Major Interactions (Avoid)

• Amantadine: combined NMDA antagonism may increase neuro‑psychiatric side effects.
• Ketamine: additive CNS depression and dissociative effects.
• High‑dose quinidine: may raise memantine plasma concentrations.

Moderate Interactions (Monitor Closely)

• Anticholinesterase inhibitors (e.g., donepezil): monitor for enhanced cognitive effects.
• Diuretics (e.g., furosemide): watch for electrolyte disturbances, especially hyponatremia.
• Antihypertensives: possible additive hypotensive effect.