The monitoring checklist for NMDA receptor antagonists in Alzheimer's care focuses on memantine, the only drug in this class approved for dementia. An NMDA receptor antagonist is a drug that blocks NMDA receptors to limit excess glutamate activity in the brain. This checklist applies to moderate-to-severe dementia of the Alzheimer's type, which affects mid-to-late-stage patients. According to the National Institute on Aging, memantine controls symptoms without curing or reversing Alzheimer's brain disease, so caregivers track benefits and side effects over time (how Alzheimer's is treated).
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What does this drug do for Alzheimer's?
- Which day-to-day effects should you log?
- When should you seek prompt care?
- How do kidneys and other drugs change risk?
- How do you give each dose safely?
What does this drug do for Alzheimer's?
Memantine blocks toxic effects of excess glutamate and regulates glutamate activation. Glutamate is a brain chemical that can harm nerve cells when overactive. The drug eases symptoms but does not stop brain disease.
Caregivers should watch daily function, memory, and behavior, not expect recovery. Continue treatment even when the person seems stable. Ask the clinician what change would signal benefit or loss of benefit.
Which day-to-day effects should you log?
Track dizziness, headache, confusion, constipation or diarrhea, sleepiness, and fatigue. In extended-release trials, dizziness occurred in 5% on memantine versus 1% on placebo, according to the Alzheimer's Association (medications for memory). Note date, time, severity, falls, and missed activities.
Use the same notebook, app, or calendar each day. Bring the log to each visit. A clear pattern helps the clinician adjust care faster.
When should you seek prompt care?
Seek prompt care for hallucinations, chest pain, trouble urinating, severe dizziness or fainting, or seizure. Memantine was not systematically evaluated in seizure disorders and requires caution there.
Do not wait to see if these signs pass on their own. Call the clinician, urgent care, or emergency services right away for these signs.
- sudden fainting, fall, or cannot stay awake
- seeing or hearing things that are not there
- chest pain, very slow or pounding heartbeat
- cannot urinate, painful urination, or seizure
How do kidneys and other drugs change risk?
Memantine leaves the body mainly through the kidneys, so the care team should monitor renal function. Reduced dosing is used in severe renal impairment to prevent buildup and toxicity such as confusion and hallucinations. Urine pH also matters because alkaline urine slows memantine removal and raises blood levels. Triggers include sodium bicarbonate, carbonic-anhydrase inhibitors, renal tubular acidosis, and major meat-to-vegetarian diet shifts.
Tell the clinician about new prescriptions, antacids, diuretics, diet changes, and kidney disease. Avoid or closely monitor combined use with other NMDA antagonists such as amantadine, ketamine, and dextromethorphan. Coadministration may cause additive central nervous system effects and psychosis-like reactions. Bring a full drug and supplement list to each visit.
How do you give each dose safely?
Give memantine at the same time daily, with or without food. Swallow extended-release capsules whole or sprinkle the contents on applesauce for immediate use. Do not divide, chew, or save sprinkled doses for later.
Continue treatment even if the person feels well, and do not stop abruptly. After a missed or extra dose, call the clinician or poison control before taking another dose. Keep pills in the original container and track refills.
