For an Alzheimer's patient taking memantine, monitor the dose, missed doses, kidney status, other medicines, side effects, and changes in thinking or behavior. Memantine treats symptoms of moderate-to-severe Alzheimer's dementia but does not cure the disease, according to the DailyMed prescribing information. Keep one written record that both the caregiver and patient's clinicians can review. Update it after every dose change, new symptom, missed dose, or medication change.
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 to record before treatment or a dose change
- How to track titration and missed doses
- Which side effects need attention
- Check medicines and possible interactions
- Prepare for follow-up and prevent dosing errors
What to record before treatment or a dose change
Write down the prescribed dose, dosing times, and the date treatment starts. Also record the patient's usual cognitive, behavioral, and physical symptoms.
This baseline makes later changes easier to describe. Review these items with the prescriber: Kidney status matters because severe renal impairment—creatinine clearance of 5–29 mL/min—calls for a target of 5 mg twice daily. The prescriber should determine whether that limit applies.
- Current memantine dose and dosing schedule
- Date and effect of the most recent dose change
- Kidney-function status
- Every prescription and over-the-counter medicine
- Vitamins, supplements, and herbal products
How to track titration and missed doses
For immediate-release memantine, clinicians typically start with 5 mg once daily. The dose may rise by 5 mg no more often than weekly, up to 10 mg twice daily, as detailed in the DailyMed dosing instructions.
After each increase, record: If one dose is missed, do not double the next dose. If the patient has stopped memantine for several days, contact the prescriber before restarting. The patient may need to resume at a lower dose and work upward again.
- The new dose and start date
- Whether each dose was taken
- New or worsening symptoms
- Changes in thinking or behavior
- Questions to raise at the next appointment
Which side effects need attention
Check regularly for dizziness, headache, confusion, and constipation. These were the most common adverse reactions reported in controlled trials, occurring in at least 5% of memantine-treated patients and more often than with placebo, according to DailyMed's adverse-reaction summary.
For each symptom, note when it began, how often it happens, and whether it followed a dose increase. Record concrete observations, such as dizziness while walking or constipation lasting several days, instead of writing only "felt worse." Seek prompt medical advice if hallucinations or shortness of breath appears. MedlinePlus identifies both as serious possible effects of memantine in its patient drug information.
Check medicines and possible interactions
Give the prescriber and pharmacist a complete product list. Include nonprescription cough or cold remedies, vitamins, supplements, and herbal products—not only regular prescriptions. Specifically flag amantadine, ketamine, and dextromethorphan because concurrent use requires caution.
Dextromethorphan may appear in over-the-counter cough products, so record product names and ingredients. Conditions that make urine alkaline can reduce memantine clearance by about 80%, allowing more medicine to remain in the body. Do not change or stop a product independently; ask the prescriber or pharmacist to review the full list.
Prepare for follow-up and prevent dosing errors
Regular appointments should assess cognitive and behavioral changes as well as medication use. A caregiver should attend because a person with Alzheimer's may not provide a reliable account of doses or symptoms. Bring the medication record, symptom notes, and questions to every evaluation.
The Alzheimer's Association also recommends keeping an up-to-date medication-and-dose list, using a pill organizer or calendar, and never changing doses without medical direction. Store medicines securely to prevent accidental overdose. If several people provide care, identify who gives each dose and mark it immediately on the shared calendar.
