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MEMANTINE PFIZER 20 MG FILM-COATED TABLETS
Memantine 10 mg film-coated tablets
Memantine 20 mg film-coated tablets
Read all of this leaflet carefully before you start taking this medicine because it contains
important information for you.
Keep this leaflet. You may need to read it again.
If you have any further questions, ask your doctor, pharmacist or nurse.
This medicine has been prescribed for you only. Do not pass it on to others. It may harm
them, even if their signs of illness are the same as yours.
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any
possible side effects not listed in this leaflet.
What is in this leaflet:
What Memantine is and what it is used for
What you need to know before you take Memantine
How to take Memantine
Possible side effects
How to store Memantine tablets
Contents of the pack and other information
1. What Memantine is and what it is used for
How does Memantine work
Memantine belongs to a group of medicines known as anti-dementia medicines.
Memory loss in Alzheimer’s disease is due to a disturbance of message signals in the brain. The
brain contains so-called N-methyl-D-aspartate (NMDA)-receptors that are involved in
transmitting nerve signals important in learning and memory. Memantine belongs to a group of
medicines called NMDA-receptor antagonists. Memantine acts on these NMDA-receptors
improving the transmission of nerve signals and the memory.
What is Memantine used for
Memantine is used for the treatment of patients with moderate to severe Alzheimer’s disease.
2. What you need to know before you take Memantine
Do not take Memantine
- if you are allergic to memantine hydrochloride or any of the other ingredients of this medicine
(listed in section 6).
Warnings and precautions
Talk to your doctor, pharmacist or nurse before taking Memantine :
- if you have a history of epileptic seizures
- if you have recently experienced a myocardial infarction (heart attack), or if you are suffering
from congestive heart failure or from an uncontrolled hypertension (high blood pressure).
In these situations the treatment should be carefully supervised, and the clinical benefit of
Memantine reassessed by your doctor on a regular basis.
If you suffer from renal impairment (kidney problems), your doctor should closely monitor your
kidney function and if necessary adapt the memantine doses accordingly.
The use of medicinal products called amantadine (for the treatment of Parkinson’s disease),
ketamine (a substance generally used as an anaesthetic), dextromethorphan (generally used to
treat cough) and other NMDA-antagonists at the same time should be avoided.
Memantine is not recommended for children and adolescents under the age of 18 years.
Other medicines and Memantine
Tell your doctor or pharmacist if you are taking, have recently taken or might take any other
In particular, Memantine may change the effects of the following medicines and their dose may
need to be adjusted by your doctor:
amantadine, ketamine, dextromethorphan
cimetidine, ranitidine, procainamide, quinidine, quinine, nicotine
hydrochlorothiazide (or any combination with hydrochlorothiazide)
anticholinergics (substances generally used to treat movement disorders or intestinal cramps)
anticonvulsants (substances used to prevent and relieve seizures)
barbiturates (substances generally used to induce sleep)
dopaminergic agonists (substances such as L-dopa, bromocriptine)
neuroleptics (substances used in the treatment of mental disorders)
If you go into hospital, let your doctor know that you are taking Memantine .
Memantine with food and drink
You should inform your doctor if you have recently changed or intend to change your diet
substantially (e.g. from normal diet to strict vegetarian diet) or if you are suffering from states of
renal tubulary acidosis (RTA, an excess of acid-forming substances in the blood due to renal
dysfunction (poor kidney function)) or severe infections of the urinary tract (structure that carries
urine), as your doctor may need to adjust the dose of your medicine.
Pregnancy and breast-feeding
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby,
ask your doctor or pharmacist for advice before taking this medicine. The use of memantine in
pregnant women is not recommended.
Women taking Memantine should not breast-feed.
Driving and using machines
Your doctor will tell you whether your illness allows you to drive and to use machines safely.
Also, Memantine may change your reactivity, making driving or operating machinery
3. How to take Memantine
Always take this medicine exactly as your doctor or pharmacist has told you. Check with your
doctor or pharmacist if you are not sure.
The recommended dose of Memantine for adults and elderly patients is 20 mg once a day.
In order to reduce the risk of side effects this dose is achieved gradually by the following daily
treatment scheme. For up-titration other tablet strengths are available.
half a 10 mg tablet
one 10 mg tablet
one and a half 10 mg tablet
week 4 and beyond
two 10 mg tablets or one 20 mg tablet once a day
The usual starting dose is half a 10 mg tablet once a day (5 mg) for the first week. This is
increased to one 10 mg tablet once a day (10 mg) in the second week and to 1 and a half 10 mg
tablet once a day in the third week. From the fourth week on, the usual dose is two 10 mg tablets
or one 20 mg tablet once a day (20 mg).
At the beginning of treatment you will start by using 5 mg once a day. This dose will be increased
weekly by 5 mg until the recommended (maintenance) dose is reached. The recommended
maintenance dose is 20 mg once a day, which is reached at the beginning of the 4th week.
Dosage in patients with impaired kidney function
If you have impaired kidney function, your doctor will decide upon a dose that suits your
condition. In this case, monitoring of your kidney function should be performed by your doctor at
Memantine should be administered orally once a day. To benefit from your medicine you should
take it regularly every day at the same time of the day. The tablets should be swallowed with
The tablets can be taken with or without food.
Duration of treatment
Continue to take Memantine as long as it is of benefit to you. Your doctor should assess your
treatment on a regular basis.
If you take more Memantine than you should
- In general, taking too much Memantine should not result in any harm to you. You may
experience increased symptoms as described in section 4. “Possible side effects”.
- If you take a large overdose of Memantine, contact your doctor or get medical advice, as you
may need medical attention.
If you forget to take Memantine
- If you find you have forgotten to take your dose of Memantine, wait and take your next dose at
the usual time.
- Do not take a double dose to make up for a forgotten dose.
If you have any further questions on the use of this medicine, ask your doctor, pharmacist or
4. Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them.
In general, the observed side effects are mild to moderate.
Common (may affect up to 1 in 10 people):
• Headache, sleepiness, constipation, elevated liver function tests, dizziness, balance disorders,
shortness of breath, high blood pressure and drug hypersensitivity
Uncommon (may affect up to 1 in 100 people):
• Tiredness, fungal infections, confusion, hallucinations, vomiting, abnormal gait, heart failure
and venous blood clotting (thrombosis/thromboembolism)
Very Rare (may affect up to 1 in 10,000 people):
Not known (frequency cannot be estimated from the available data):
• Inflammation of the pancreas, inflammation of the liver (hepatitis) and psychotic reactions
Alzheimer’s disease has been associated with depression, suicidal ideation and suicide. These
events have been reported in patients treated with Memantine.
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible
side effects not listed in this leaflet.
Reporting of side effects
If you get any side effects talk to your doctor, pharmacist or nurse. This includes any possible
side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card
Scheme at: www.mhra.gov.uk/yellowcard by reporting side effects you can help provide more
information on the safety of this medicine.
5. How to store Memantine
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date which is stated on the carton, label and the blister
after EXP. The expiry date refers to the last day of that month.
This medicinal product does not require any special storage conditions.
Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how
to throw away medicines you no longer use. These measures will help protect the environment.
6. Contents of the pack and other information
The active substance is memantine hydrochloride. Each tablet contains 10 mg /20 mg of
memantine hydrochloride equivalent to 8.31 mg /16.62 mg memantine.
The other ingredients are:
Tablet core: Silica colloidal anhydrous, cellulose, microcrystalline, silicified microcrystalline
cellulose, sodium starch glycolate, talc, sodium stearyl fumarate.
Tablet film-coat: Hypromellose, macrogol 6000, talc, titanium dioxide (E 171), iron oxide yellow
(E 172) for 20 mg, iron oxide red (E 172) for 20 mg.
What Memantine looks like and contents of the pack
Memantine 10 mg film-coated tablets:
White to off-white, centrally tapered oblong, biconvex, film-coated tablets with a single break
line on both sides and debossed with 'Z' and '03' on either side of break line on one side and plain
on other side. The tablet can be divided in equal doses.
Memantine 20 mg film-coated tablets:
Pale-red to grey-red, oval oblong, film-coated tablets debossed with 'Z' on one side arid '06' on
Memantine tablets are available in clear PVC/PE/PVDC/Aluminium lidding foil blisters.
10 mg: 1, 10, 28, 30, 50, 56, 98, 100 and 112 tablets
20 mg: 10, 28, 30, 42, 56 and 98 tablets
Not all pack sizes may be marketed.
Marketing Authorisation Holder
Kent CT13 9NJ.
Pfizer Service Company BVBA
Hoge Wei 10, 1930, Zaventem
Zone industrielle, 29, route des Industries, 37530 Pocé -Sur-Cisse
Pfizer Italia s.r.l
Località Marino Del Tronto, 63100 - Ascoli Piceno (AP)
This leaflet was last approved in 10/2013
Source: Medicines and Healthcare Products Regulatory Agency
Disclaimer: Every effort has been made to ensure that the information provided here is accurate, up-to-date and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This information has been compiled for use by healthcare practitioners and consumers in the United States. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective or appropriate for any given patient. If you have questions about the substances you are taking, check with your doctor, nurse or pharmacist.