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Drug Interactions

Memantine can potentially interact with a few other medicines (see Drug Interactions With Memantine).

What If I Take an Overdose of Memantine?

People who take too much memantine may have overdose symptoms that could include:
  • Agitation or restlessness
  • Confusion
  • Changes in the heart rhythm
  • Unconsciousness
  • Psychosis (such as hallucinations or delusions)
  • Drowsiness
  • Vertigo (a spinning sensation)
  • Slow movement or an unsteady gait
  • Vomiting
  • Weakness
  • Coma.
If you happen to overdose, seek immediate medical attention.
(Click Namenda Overdose for more information.)

How Should It Be Stored?

Memantine tablets and liquid should be stored at room temperature, away from moisture and heat. Keep this and all other medications out of the reach of children.

What Should I Do If I Miss a Dose?

If you forget to take a dose of memantine, take your missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose.

Who Makes Memantine?

Memantine is made by Forest Laboratories, Inc.


Memantine is available in the following strengths and forms:
  • Memantine 5 mg tablets
  • Memantine 10 mg tablets
  • Memantine 2 mg/mL oral solution, which contains 2 mg of memantine per mL (equivalent to 10 mg per teaspoonful).
Memantine oral solution (liquid) is clear, peppermint-flavored, alcohol-free, and sugar-free.
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Memantine Hydrochloride (HCL)

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