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For visual reference only; actual product may vary
US Name:
Symmetrel
Alternative Names:
Pk Merz
Active Ingredients:
Amantadine
Brand Manufacturer:
Merz Pharma
Manufacturer Location:
Germany
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For visual reference only; actual product may vary
Symmetrel (Amantadine) is approved to treat symptoms of Parkinson’s disease and movement disorders caused by certain drugs. It also functions as an antiviral medication for the prevention and treatment of influenza A virus infections, offering versatile therapeutic action for patients.
Symmetrel is an oral medication with the active ingredient amantadine. It has a unique dual-action role in medicine. It is classified both as an antiparkinsonian agent and as an antiviral drug. Symmetrel works by affecting the balance of certain chemicals in the brain. It also stops the growth of viruses in the body. This makes it a versatile treatment for very different medical conditions. It helps patients manage movement disorders and fight viral infections.
Symmetrel works in two distinct ways depending on the condition being treated. For Parkinson’s disease, Symmetrel is thought to increase the effects of dopamine. Dopamine is a natural chemical in the brain involved in movement. By enhancing dopamine’s activity, it helps reduce symptoms like stiffness and shaking. As an antiviral, Symmetrel targets the influenza A virus. It blocks a specific channel (the M2 protein) that the virus needs to replicate inside host cells. This action prevents the virus from multiplying and spreading.
Symmetrel is prescribed for patients with specific medical needs. It is suitable for individuals diagnosed with Parkinson’s disease to help manage their motor symptoms. Doctors also prescribe it for patients experiencing extrapyramidal reactions. These are movement disorders caused by certain medications. Additionally, Symmetrel is used for the prevention and treatment of influenza A infections. This is especially useful during community outbreaks or for high-risk individuals. A doctor must determine if Symmetrel is right for you.
Symmetrel dosage and administration must be determined by a healthcare provider. The right dose depends on your age, condition, and kidney function. It is usually taken once or twice a day in capsule or liquid form. You can take Symmetrel with or without food. To reduce potential sleep disturbances, try taking the last dose of the day several hours before bedtime. Always follow your doctor’s instructions exactly. Do not change your dose or stop taking it without medical advice.
Symmetrel can cause side effects, though not everyone experiences them. Common effects include nausea, dizziness, and constipation. Some people may also notice dry mouth, blurred vision, or have trouble sleeping. A less common but notable side effect is livedo reticularis. This is a mottled, purplish discoloration of the skin. More serious side effects can also occur. These may include confusion, depression, or swelling in the ankles. Report any unusual or persistent symptoms to your doctor immediately.
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Some patients may experience side effects while taking Symmetrel. Common side effects can include:
If any of these side effects persist or worsen, you should contact your doctor promptly. More serious side effects can occur, so it is important to discuss all potential risks with your healthcare provider.
Symmetrel (Amantadine) is used for several medical conditions:
Symmetrel's effects on Parkinson's symptoms can often be noticed within a few days to two weeks of starting treatment. However, the full therapeutic benefit might take several weeks to become apparent. Patients should follow their doctor’s instructions and report their progress, as individual responses to the medication can vary. Consistency is key for achieving the best results.
Symmetrel is specifically an antiviral medication effective against influenza A virus strains. It is not effective for treating infections caused by the influenza B virus or other viruses like the common cold. Your doctor can determine the type of influenza infection you have and if Symmetrel is the appropriate treatment for your condition.
If you miss a dose of Symmetrel, you should take it as soon as you remember. However, if it is almost time for your next scheduled dose, you should skip the missed dose entirely. Do not take a double dose to make up for the one you missed, as this can increase your risk of side effects.
Symmetrel can be taken with or without food, depending on your preference. Some patients find that taking it with a meal or a snack can help reduce the chances of experiencing nausea or an upset stomach. Follow your doctor or pharmacist's specific instructions for taking your prescription for the best results.
Symmetrel may cause dizziness and lightheadedness, and drinking alcohol can worsen these effects. It is generally recommended to limit or avoid alcohol consumption while taking this medication. Discuss your alcohol use with your doctor to understand the potential interactions and receive personalized advice based on your health condition.
Symmetrel can cause nervousness or trouble sleeping as a side effect in some patients. To minimize this, your doctor may advise you to take your last dose of the day several hours before you go to bed. If insomnia persists or becomes bothersome, consult your healthcare provider for further guidance.
Symmetrel is not classified as a controlled substance by the U.S. Drug Enforcement Administration (DEA). It is a prescription medication used to treat Parkinson's disease and influenza A. While it does affect brain chemistry, its potential for abuse is not considered high enough to warrant classification as a controlled drug.
Symmetrel should not be stopped suddenly, especially when used for Parkinson's symptoms. Abruptly discontinuing the drug can lead to a sharp worsening of symptoms or other complications. Your doctor will provide a plan to gradually reduce your dose to stop treatment safely and minimize potential adverse effects.
Symmetrel should be stored at room temperature, away from excess heat, light, and moisture. Do not store it in the bathroom where humidity is high. Keep the medication in its original container and ensure the lid is tightly closed. As with all medicines, keep it safely out of reach of children and pets.
Symmetrel can cause a skin condition called livedo reticularis in some individuals. This appears as a purplish, mottled, net-like pattern on the skin, usually on the legs. While it is generally not harmful and resolves after stopping the drug, you should report any new skin changes to your doctor promptly for proper evaluation.
Symmetrel may cause blurred vision as a side effect. This can impair your ability to drive or operate heavy machinery safely. If you experience blurred vision or any other changes in your sight, you should exercise caution and avoid such activities. Inform your doctor if the effect persists or becomes severe.
Symmetrel can interact with several other types of medications, including certain diuretics, anticholinergics, and stimulants. These interactions can increase the risk of side effects. It is very important to provide your doctor with a complete list of all the prescription drugs, over-the-counter medicines, and supplements you are currently taking.
Symmetrel is generally not recommended for use during pregnancy unless the potential benefit justifies the potential risk to the fetus, as it may cause harm. If you are pregnant, planning to become pregnant, or breastfeeding, you must discuss the use of Symmetrel with your doctor to make an informed decision about your treatment plan.
Symmetrel is sometimes prescribed off-label to help manage fatigue associated with multiple sclerosis (MS). While not an FDA-approved indication, some studies and clinical experience suggest it may be beneficial for certain patients. This use should only be considered under the direct supervision and prescription of a qualified healthcare provider familiar with your condition.
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Struggling with acid reflux? Sarah Ryan shares her personal experience using Nexium for GERD and how to find affordable brand-name relief through a licensed pharmacy.

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Off-label prescribing means using an FDA-approved medication outside thant defined approved use.
The drug itself is identical; only the purpose, dose, age group, or form differs.
Off-label prescribing is legal in the United States and is governed by physician judgement.


