Memantine is a medication used to treat moderate to severe alzheimer disease. It belongs to a class of drugs called nmda receptor antagonists. The drug works by reducing the activity of glutamate, an excitatory neurotransmitter in the brain. By blocking nmda receptors, it helps prevent excessive calcium influx that can damage nerve cells. This action is thought to slow the progression of cognitive decline in patients with the disease. Memantine is taken orally in tablet form and is usually prescribed alongside other supportive therapies. Its therapeutic effect is primarily to improve symptoms such as memory loss and confusion without reversing existing brain damage. The medication is considered safe for long-term use when monitored by a healthcare professional.

Memantine is a medication used to treat moderate to severe alzheimer disease by slowing symptom progression. It works by blocking excess activity of the glutamate receptor nmda in the brain. Glutamate is a chemical messenger that, when overactive, can damage nerve cells in neurodegenerative disease. By occupying the nmda receptor without fully activating it, Memantine reduces excitotoxicity while preserving normal signaling. This selective antagonism helps maintain cognitive function and daily living abilities in patients with alzheimer disease. Memantine is well absorbed, crosses the blood-brain barrier efficiently, and is eliminated primarily unchanged through the kidneys, giving it a predictable therapeutic effect.

Memantine may cause dizziness in some patients. Headache is a commonly reported adverse effect. Confusion or difficulty concentrating can occur, especially in the early stages of treatment. Gastrointestinal symptoms such as constipation or nausea are also possible. Mild fatigue or weakness has been observed in clinical studies. These effects are generally reversible when the dose is adjusted or therapy is discontinued.

Memantine may cause dizziness or light-headedness in some patients. Headache and fatigue are also reported side effects. Gastrointestinal disturbances such as constipation or nausea can occur. Mild increases in blood pressure have been observed in certain individuals. Confusion or abnormal thinking may appear especially in older adults. Rare allergic reactions including rash or swelling can develop.