<unk>  is a medication used to slow the progression of moderate-to-severe Alzheimer's disease. It is taken by mouth. Common side effects include headache, constipation, sleepiness, and dizziness. Severe side effects may include blood clots, psychosis, and heart failure. It is believed to work by blocking NMDA receptors.<unk>  was approved for medical use in the United States in 2003. It is available as a generic medication. In 2019, it was the 169th most commonly prescribed medication in the United States, with more than 3million prescriptions.
Memantine
Rivastigmine
Donepezil
Nusinersen
Bromperidol decanoate
Perhexiline
Carbidopa/levodopa
Rilonacept