Symmetrel

DRUG DESCRIPTION

SYMMETREL (Amantadine Hydrochloride, USP) is designated generically as amantadine hydrochloride and chemically as 1-adamantanamine hydrochloride.

SYMMETREL®
  (Amantadine Hydrochloride) Structural Formula Illustration

Amantadine hydrochloride is a stable white or nearly white crystalline powder, freely soluble in water and soluble in alcohol and in chloroform.

Amantadine hydrochloride has pharmacological actions as both an anti-Parkinson and an antiviral drug.

SYMMETREL (amantadine hydrochloride) is available in tablets and syrup.

Each tablet intended for oral administration contains 100 mg amantadine hydrochloride and has the following inactive ingredients: hydroxypropyl methylcellulose, magnesium stearate, microcrystalline cellulose, sodium starch glycolate, FD&C Yellow No. 6.

SYMMETREL syrup contains 50 mg of amantadine hydrochloride per 5 mL and has the following inactive ingredients: artificial raspberry flavor, citric acid, methylparaben, propylparaben, and sorbitol solution.

What are the possible side effects of amantadine (Symmetrel)?

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

Call your doctor at once if you have any of these serious side effects:

  • feeling short of breath, even with mild exertion;
  • swelling, rapid weight gain;
  • feeling depressed, agitated, or aggressive;
  • behavior changes, hallucinations, thoughts of hurting yourself;
  • urinating less than usual or not at all;
  • high...

Read All Potential Side Effects and See Pictures of Symmetrel »

What are the precautions when taking amantadine hydrochloride (Symmetrel)?

Before taking amantadine, tell your doctor or pharmacist if you are allergic to it; or to rimantadine; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: a certain type of eye disease (untreated closed-angle glaucoma).

Before using this medication, tell your doctor or pharmacist your medical history, especially of: swelling of arms/legs (peripheral edema), heart problems (e.g., congestive heart failure), blood pressure problems (e.g., dizziness when standing), kidney disease, liver disease,...

Read All Potential Precautions of Symmetrel »


Symmetrel Consumer (continued)

SIDE EFFECTS: Blurred vision, nausea, stomach upset, drowsiness, dizziness, headache, dry mouth, constipation, nervousness, or trouble sleeping may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur: purplish-red blotchy spots on the skin, swelling of the ankles/feet, difficulty urinating, vision changes.

Tell your doctor immediately if any of these rare but very serious side effects occur: shortness of breath, mental/mood changes (such as depression, suicidal thoughts/attempts, compulsive behavior including urge to gamble), muscle stiffness, uncontrolled muscle movements, unusual sweating, fast heartbeat, unexplained fever, seizures.

A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: Before taking amantadine, tell your doctor or pharmacist if you are allergic to it; or to rimantadine; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: a certain type of eye disease (untreated closed-angle glaucoma).

Before using this medication, tell your doctor or pharmacist your medical history, especially of: swelling of arms/legs (peripheral edema), heart problems (e.g., congestive heart failure), blood pressure problems (e.g., dizziness when standing), kidney disease, liver disease, mental/mood conditions (e.g., depression, psychosis), seizures, a certain skin condition (eczematoid dermatitis).

This drug may make you dizzy or drowsy or cause blurred vision. Do not drive, use machinery, or do any activity that requires alertness or clear vision until you are sure you can perform such activities safely. Avoid alcoholic beverages.

To minimize dizziness and lightheadedness, get up slowly when rising from a seated or lying position.

If you are taking this medication for Parkinson's disease, be careful not to overdo physical activity as your condition improves because this may increase your risk of falls. Consult your doctor about a plan to gradually increase your physical activity as symptoms improve.

Kidney function declines as you grow older. This medication is removed by the kidneys. Therefore, elderly people may be at a greater risk for side effects while taking this drug.

This medication should be used during pregnancy only if clearly needed. There are rare reports of heart defects in newborns whose mothers took amantadine during pregnancy. Discuss the risks and benefits with your doctor.

This drug passes into breast milk and may have undesirable effects on a nursing infant. Consult with your doctor before breast-feeding.


Symmetrel Patient Information Including Side Effects

Brand Names: Symmetrel

Generic Name: amantadine (Pronunciation: a MAN ta deen)

  • What is amantadine (Symmetrel)?
  • What are the possible side effects of amantadine (Symmetrel)?
  • What is the most important information I should know about amantadine (Symmetrel)?
  • What should I discuss with my healthcare provider before taking amantadine (Symmetrel)?
  • How should I take amantadine (Symmetrel)?
  • What happens if I miss a dose (Symmetrel)?
  • What happens if I overdose (Symmetrel)?
  • What should I avoid while taking amantadine (Symmetrel)?
  • What other drugs will affect amantadine (Symmetrel)?
  • Where can I get more information?

What is amantadine (Symmetrel)?

Amantadine is an antiviral medication. It blocks the actions of viruses in your body.

Amantadine is used to treat and to prevent influenza A (a viral infection). There may be some flu seasons during which amantadine is not recommended because certain flu strains may be resistant to this drug.

Amantadine is also used to treat Parkinson's disease and "Parkinson-like" symptoms such as stiffness and shaking that may be caused by the use of certain drugs.

Amantadine may also be used for other purposes not listed in this medication guide.

What are the possible side effects of amantadine (Symmetrel)?

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

Call your doctor at once if you have any of these serious side effects:

  • feeling short of breath, even with mild exertion;
  • swelling, rapid weight gain;
  • feeling depressed, agitated, or aggressive;
  • behavior changes, hallucinations, thoughts of hurting yourself;
  • urinating less than usual or not at all;
  • high fever, stiff muscles, confusion, sweating, fast or uneven heartbeats, rapid breathing, feeling like you might pass out;
  • restless muscle movements in your eyes, tongue, jaw, or neck; or
  • tremor (uncontrolled shaking).

Less serious side effects may include:

  • dizziness, drowsiness, headache;
  • sleep problems (insomnia), strange dreams;
  • feeling nervous;
  • nausea, diarrhea, constipation, loss of appetite;
  • dry mouth, dry nose; or
  • loss of balance or coordination.

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. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about amantadine (Symmetrel)?

Do not use FluMist nasal influenza "live vaccine" while you are being treated with amantadine and for at least 48 hours after you stop taking amantadine. The nasal vaccine may not be as effective if you receive it while you are taking amantadine. Before taking amantadine, tell your doctor if you have received a nasal flu vaccine within the past 14 days.

Before taking amantadine, tell your doctor if you have epilepsy or other seizure disorder, congestive heart failure, kidney or liver disease, low blood pressure, eczema, glaucoma, or a history of mental illness, suicide attempt, or drug/alcohol addiction.

Amantadine can cause side effects that may impair your thinking, vision, or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.

If you are taking amantadine to treat influenza A, take the medication for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated.

If you are taking amantadine to treat Parkinson symptoms, do not stop taking the medication without first talking to your doctor. If you stop taking amantadine suddenly, your condition may become worse.

You may have increased sexual urges, unusual urges to gamble, or other intense urges while taking this medication. Talk with your doctor if you believe you have any intense or unusual urges while taking amantadine.

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