Memantine (By mouth)

There may be other brand names for this medicine.

You should not use this medicine if you have had an allergic reaction to memantine.

Take your medicine as directed. Your dose may need to be changed several times to find what works best for you. Most people need to wait at least one week between dose changes.
You may take this medicine with or without food.
Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.
Swallow the extended-release capsule whole. Do not crush, break, or chew it.
If you cannot swallow the extended-release capsule, you may open it and pour the medicine into a small amount of soft food such as pudding, yogurt, or applesauce. Stir this mixture well and swallow it without chewing.
For the liquid and extended-release capsule form: Read and follow the patient instructions that come with this medicine. Talk to your doctor or pharmacist if you have any questions.

Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
Keep all medicine out of the reach of children. Never share your medicine with anyone.

Make sure your doctor knows if you are also using amantadine (Symmetrel®), cimetidine (Tagamet®), ketamine (Ketalar®), metformin (Glucophage®), quinidine (Cardioquin®, Quinaglute®, Quinidex®), or ranitidine (Zantac®).
Tell your doctor if you are also using a diuretic or "water pill" (such as acetazolamide, hydrochlorothiazide [HCTZ], methazolamide, triamterene, Diamox®, Dyazide®, Dyrenium®, Maxzide®, or Neptazane®) or an antacid or laxative that contains sodium bicarbonate, baking soda, or bicarbonate of soda (such as Alka-Seltzer®).
Tell your doctor if you smoke or if you are using a stop-smoking aid that contains nicotine (such as Nicoderm®, Nicorette®, or Nicotrol®) or a cold or cough medicine that contains dextromethorphan (DayQuil®, NyQuil®, Robitussin® DM, or TheraFlu®).

Make sure your doctor knows if you are pregnant or breastfeeding, or if you have kidney disease, liver disease, bladder problems or difficulty with urination, or epilepsy or seizures.
Check with your doctor right away if you get a urinary tract infection. This includes any infection in your bladder or kidneys. Your dose of this medicine might need to be changed while you have an infection.
Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.

Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
Change in how much or how often you urinate.
Chest pain.
Lightheadedness, dizziness, or fainting.
Seeing or hearing things that are not there.
Severe sleepiness, restlessness, or confusion.
Sudden or severe headache.

Last Updated: 1/27/2017