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Details with Side Effects
Signs and symptoms most often accompanying overdosage with other formulations of memantine in clinical trials and from worldwide marketing experience, alone or in combination with other drugs and/or alcohol, include agitation, asthenia, bradycardia, confusion, coma, dizziness, ECG changes, increased blood pressure, lethargy, loss of consciousness, psychosis, restlessness, slowed movement, somnolence, stupor, unsteady gait, visual hallucinations, vertigo, vomiting, and weakness. The largest known ingestion of memantine worldwide was 2 grams in an individual who took memantine in conjunction with unspecified antidiabetic medications. This person experienced coma, diplopia, and agitation, but subsequently recovered.
One patient participating in a NAMENDA XR (memantine hydrochloride extended release capsules) clinical trial unintentionally took 112 mg of NAMENDA XR (memantine hydrochloride extended release capsules) daily for 31 days and experienced an elevated serum uric acid, elevated serum alkaline phosphatase, and low platelet count.
No fatalities have been noted with overdoses of memantine alone. A fatal outcome has very rarely been reported when memantine has been ingested as part of overdosing with multiple drugs; in those instances, the relationship between memantine and a fatal outcome has been unclear.
Because strategies for the management of overdose are continually evolving, it is advisable to contact a poison control center to determine the latest recommendations for the management of an overdose of any drug. As in any cases of overdose, general supportive measures should be utilized, and treatment should be symptomatic. Elimination of memantine can be enhanced by acidification of urine.
NAMENDA XR (memantine hydrochloride extended release capsules) is contraindicated in patients with known hypersensitivity to memantine hydrochloride or to any excipients used in the formulation [see DESCRIPTION].
Last reviewed on RxList: 7/22/2010
This monograph has been modified to include the generic and brand name in many instances.
Additional Namenda XR Information
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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