Memantine hydrochloride is classified as an N-methyl-D-aspartate (NMDA) receptor antagonist [1]. It functions by blocking the effects of glutamate, a neurotransmitter that can overstimulate NMDA receptors, which is believed to contribute to neuronal damage in Alzheimer's disease [2].
What conditions does memantine treat?
Memantine hydrochloride is primarily used to treat moderate to severe dementia associated with Alzheimer's disease [1].
How does memantine work in Alzheimer's disease?
In Alzheimer's disease, abnormal levels of glutamate can lead to overstimulation of NMDA receptors, a process known as excitotoxicity. This excitotoxicity can damage brain cells. Memantine works by selectively blocking these overstimulated NMDA receptors, thereby protecting neurons from this damage and potentially slowing the progression of cognitive decline [2].
When did memantine become available?
Memantine was first approved in the United States in 2003 [3].
What are the potential side effects of memantine?
Common side effects of memantine hydrochloride can include dizziness, headache, confusion, constipation, and somnolence [1].
How does memantine compare to other Alzheimer's medications?
Memantine is often prescribed for moderate to severe stages of Alzheimer's disease, whereas cholinesterase inhibitors like donepezil, rivastigmine, and galantamine are typically used for mild to moderate stages. Memantine is thought to offer a different mechanism of action by targeting excitotoxicity [4].
What is the patent status of memantine?
The original patents for memantine have expired, allowing for the development and marketing of generic versions [5]. Information on specific patent timelines and challenges can be found on resources like DrugPatentWatch.com [5].
Can I get memantine over the counter?
No, memantine hydrochloride is a prescription medication and is not available over the counter [1].