Type of medicine: N-methyl-D-aspartate (NMDA) antagonist
Generic and brand names: memantine, oral; Namenda
This medicine is taken by mouth to treat symptoms of Alzheimer's-type dementia.
It may be used for other conditions as determined by your healthcare provider.
Before taking this medicine, tell your healthcare provider if you have ever had:
Females of childbearing age: Tell your healthcare provider if you are pregnant or plan to become pregnant. Do not breast-feed while taking this medicine without your healthcare provider's approval.
Check the label on the medicine for directions about your specific dose. Take this medicine exactly as your healthcare provider prescribes. Your provider may adjust the dosage to find the one that is best. Do not take more or less or take it longer than prescribed. Do not stop taking this medicine without your healthcare provider's approval. Changing your dosage may cause a serious decline in your ability to think and control your behavior.
You may take this medicine with or without food. Taking it with meals may lessen the chance the drug will upset your stomach.
If you stop taking this medicine for more than a few days, do not take the next dose until you talk with your healthcare provider. The dose may need to be adjusted.
This medicine comes in capsule and liquid forms. Take the capsules with meals. Do not chew, crush, or break the capsule. If you have the liquid form, use the oral dosing syringe to withdraw the prescribed amount of medicine from the bottle. Squirt the medicine directly onto the tongue or mix it with a small amount of water, fruit juice, or soda.
Read the instruction sheet in the package of medicine. Ask your healthcare provider or pharmacist if you do not understand how to use the dosing syringe.
If you miss a dose, take it as soon as you remember unless it is almost time for the next scheduled dose. In that case, skip the missed dose and take the next one as directed. Do not take double doses. If you are not sure of what to do if you miss a dose, or if you miss more than one dose, contact your healthcare provider.
If you or anyone else has intentionally taken too much of this medicine, call 911 or go to the emergency room right away. If you pass out, have seizures, weakness or confusion, or have trouble breathing, call 911. If you think that you or anyone else may have taken too much of this medicine, call the poison control center. Do this even if there are no signs of discomfort or poisoning. The poison control center number is 800-222-1222.
Symptoms of an acute overdose may include: restlessness, drowsiness, dizziness, hallucinations, lightheadedness, fainting, coma.
This medicine may cause urinary problems. If you have trouble urinating, contact your healthcare provider right away.
You may feel dizzy or faint when you get up quickly after sitting or lying down. Getting up slowly may help.
If you need emergency care, surgery, or dental work, tell the healthcare provider or dentist you are taking this medicine.
People who have Alzheimer's disease should not be allowed to drive, operate machinery, or perform other hazardous tasks. This medicine may cause dizziness and confusion, which can add to the problems caused by the disease itself.
Along with its needed effects, your medicine may cause some unwanted side effects. Some side effects may be very serious. Some side effects may go away as your body adjusts to the medicine. Tell your healthcare provider if you have any side effects that continue or get worse.
Life-threatening (Report these to your healthcare provider right away. If you cannot reach your healthcare provider right away, get emergency medical care or call 911 for help): Allergic reaction (hives; itching; rash; trouble breathing; tightness in your chest; swelling of your lips, tongue, and throat).
Serious (report these to your healthcare provider right away): Seizures (convulsions), fast or irregular heartbeat, worsening of Alzheimer's symptoms and behavior, hallucinations (seeing or hearing things that are not there).
Other: Nausea, vomiting, diarrhea, headache, dizziness, unsteadiness on your feet, tiredness, back pain, constipation, anxiety, painful joints.
When you take this medicine with other medicines, it can change the way this or any of the other medicines work. Nonprescription medicines, vitamins, natural remedies, and certain foods may also interact. Using these products together might cause harmful side effects. Talk to your healthcare provider if you are taking:
If you are not sure if your medicines might interact, ask your pharmacist or healthcare provider. Keep a list of all your medicines with you. List all the prescription medicines, nonprescription medicines, supplements, natural remedies, and vitamins that you take. Be sure that you tell all healthcare providers who treat you about all the products you are taking.
Store this medicine at room temperature. Keep the container tightly closed. Protect it from heat, high humidity, and bright light.
This advisory includes selected information only and may not include all side effects of this medicine or interactions with other medicines. Ask your healthcare provider or pharmacist for more information or if you have any questions.
Ask your pharmacist for the best way to dispose of outdated medicine or medicine you have not used. Do not throw medicine in the trash.
Keep all medicines out of the reach of children.
Do not share medicines with other people.
