Memantine is a N-methyl-D-aspartate (NMDA) receptor antagonist, that stimulates dopamine release. Memantine hydrochloride (1-amino3, 5-dimethyladamantane hydrochloride) is a tricyclic amine chemically and pharmacologically related to the anti-viral prototype amantadine and its α-methyl derivative rimantadine.
Memantine is used in Parkinson’s disease and movement disorders. Memantine hydrochloride is currently known as the latest treatment for moderate-to-severe Alzheimer disease (AD).?The drug acts by noncompetitively binding to the?N-methyl?d-aspartate (NMDA) receptors of neurons in brain tissue to prevent overstimulation by glutamate.?When this excitatory neurotransmitter over activates NMDA receptors in a tonic manner, an excessive influx of neurotoxic calcium ions follows.?The resultant excitotoxicity may play a role in the impairment of memory and cognition in AD.?Because memantine has a low-to-moderate affinity for NMDA receptors, it does not seem to block normal glutamate transmission; rather, it reduces abnormal neurotransmitter-mediated activation of the receptors,?thereby potentially reducing excitotoxic neuronal damage. This form of neuroprotection may explain the improved cognition in patients with AD.?
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