Namenda XR

Last updated on RxList: 3/18/2019
Namenda XR Side Effects Center

Last reviewed on RxList 3/18/2019

Namenda XR (memantine hydrochloride) Extended Release is an NMDA receptor antagonist used to treat moderate to severe dementia of the Alzheimer's type. Common side effects of Namenda XR include:

The recommended starting dose of Namenda XR is 7 mg once daily. The dose should be increased in 7 mg increments to a target maximum dose of 28 mg once daily. The minimum recommended interval between dose increases is one week, and only if the previous dose has been well tolerated. Namenda XR may interact with cimetidine, nicotine, ranitidine, quinidine, sodium bicarbonate, antiviral medications, cold or cough medicine containing dextromethorphan, diuretics, medicines to treat glaucoma, or oral diabetes medicines containing metformin. Tell your doctor all medications and supplements you use. Namenda XR is not expected to be harmful to a fetus. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is unknown if this drug passes into breast milk. Consult your doctor before breastfeeding.

Our Namenda XR (memantine hydrochloride) Extended Release Capsules Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

SLIDESHOW

Dementia, Alzheimer's Disease, and Aging Brains See Slideshow
Namenda XR Consumer Information

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Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • severe headache, blurred vision, pounding in your neck or ears;
  • seizure (convulsions); or
  • unusual changes in mood or behavior.

Common side effects may include:

  • diarrhea;
  • dizziness; or
  • headache.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Namenda XR (Memantine Hydrochloride Extended Release Capsules)

QUESTION

One of the first symptoms of Alzheimer's disease is __________________. See Answer
Namenda XR Professional Information

SIDE EFFECTS

Clinical Trials Experience

NAMENDA XR was evaluated in a double-blind placebo-controlled trial in which a total of 676 patients with moderate to severe dementia of the Alzheimer's type (341 patients on NAMENDA XR 28 mg/day and 335 patients on placebo) were treated for up to 24 weeks.

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Adverse Reactions Leading to Discontinuation

In the placebo-controlled clinical trial of NAMENDA XR, the proportion of patients in the NAMENDA XR group and the placebo group who discontinued treatment due to adverse reactions was 10% and 6%, respectively. The most common adverse reaction that led to treatment discontinuation in the NAMENDA XR group was dizziness, at a rate of 1.5%.

Most Common Adverse Reactions

The most commonly observed adverse reactions seen in patients administered NAMENDA XR in the controlled clinical trial, defined as those occurring at a frequency of at least 5% in the NAMENDA XR group and at a frequency higher than placebo, were headache, diarrhea and dizziness.

Table 1 lists adverse reactions that were observed at an incidence of ≥ 2% in the NAMENDA XR group and occurred at a rate greater than placebo.

Table 1: Adverse reactions observed with a frequency of ≥ 2% in the NAMENDA XR group and at a rate greater than placebo

Adverse reaction Placebo
(n = 335) %
NAMENDA XR 28mg
(n = 341) %
Gastrointestinal Disorders
  Diarrhea 4 5
  Constipation 1 3
  Abdominal pain 1 2
  Vomiting 1 2
Infections and infestations
  Influenza 3 4
Investigations
  Weight, increased 1 3
Musculoskeletal and connective tissue disorders
  Back pain 1 3
Nervous system disorders
  Headache 5 6
  Dizziness 1 5
  Somnolence 1 3
Psychiatric disorders
  Anxiety 3 4
  Depression 1 3
  Aggression 1 2
Renal and urinary disorders
  Urinary incontinence 1 2
Vascular disorders
  Hypertension 2 4
  Hypotension 1 2

Seizure

Memantine has not been systematically evaluated in patients with a seizure disorder. In clinical trials of memantine, seizures occurred in 0.3% of patients treated with memantine and 0.6% of patients treated with placebo.

Postmarketing Experience

The following adverse reactions have been identified during post-approval use of memantine.

Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. These reactions include:

Blood and Lymphatic System Disorders: agranulocytosis, leukopenia (including neutropenia), pancytopenia, thrombocytopenia, thrombotic thrombocytopenic purpura.

Cardiac Disorders: cardiac failure congestive.

Gastrointestinal disorders: pancreatitis.

Hepatobiliary Disorders: hepatitis.

Psychiatric Disorders: suicidal ideation.

Renal and Urinary Disorders: acute renal failure (including increased creatinine and renal insufficiency).

Skin Disorders: Stevens Johnson syndrome.

Read the entire FDA prescribing information for Namenda XR (Memantine Hydrochloride Extended Release Capsules)

© Namenda XR Patient Information is supplied by Cerner Multum, Inc. and Namenda XR Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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