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Symmetrel (Amantadine)

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Generic Symmetrel is an antiviral medication. It blocks the actions of viruses in your body. Generic Symmetrel is used to treat and prevent influenza A (viral infection). Generic Symmetrel 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.

Other names for this medication:

Similar Products:
Famvir, Rebetol, Sustiva, Combivir, Epivir, Retrovir


Also known as:  Amantadine.


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

Generic name of Generic Symmetrel is Amantadine.

Symmetrel is also known as Amantadine.

Brand name of Generic Symmetrel is Symmetrel.


Take this medicine with a full glass of water. If you are taking Generic Symmetrel to treat influenza A, start taking the medication within 24-48 hours after flu symptoms begin.

Do not stop taking it suddenly.


If you overdose Generic Symmetrel and you don't feel good you should visit your doctor or health care provider immediately.


Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F) away from moisture and heat. Keep container tightly closed. Throw away any unused medicine after the expiration date. Keep out of the reach of children.

Side effects

The most common side effects associated with Symmetrel are:

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Side effect occurrence does not only depend on medication you are taking, but also on your overall health and other factors.


Be careful with Generic Symmetrel while you are pregnant or have nurseling. Generic Symmetrel can pass in breast milk and harm your baby.

Do not use Generic Symmetrel if you are allergic to Generic Symmetrel components.

Do not use FluMist nasal influenza "live vaccine" while you are being treated with Generic Symmetrel and for at least 48 hours after you stop taking Generic Symmetrel. The nasal vaccine may not be as effective if you receive it while you are taking Generic Symmetrel.

Be careful with Generic Symmetrel 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.

Be careful with Generic Symmetrel if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement.

Be careful with Generic Symmetrel if you take atropine (Atreza, Sal-Tropine, and others); dicyclomine (Bentyl); glycopyrrolate (Robinul); hyoscyamine (Anaspaz, Levbid, Levsin, Nulev, and others); mepenzolate (Cantil); methscopolamine (Pamine); propantheline (Pro-Banthine); scopolamine (Maldemar, Scopace, Transderm-Scop); quinine (Qualaquin); quinidine (Cardioquin, Quinaglute); diuretic (water pill) such as triamterene (Dyrenium), hydrochlorothiazide (HCTZ, Dyazide, HydroDiuril, Hyzaar, Lopressor, Vasoretic, Zestoretic); phenothiazines such as prochlorperazine (Compazine), thioridazine (Mellaril), and others.

Avoid alcohol.

Do not stop taking it suddenly.

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Retrospective cohort study.

symmetrel drug class

To evaluate the cost effectiveness of memantine therapy compared with no pharmacological treatment in patients with moderately severe-to-severe Alzheimer's disease over a 2-year period.

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The sulfated polysaccharide, p-KG03, purified from the marine microalga, Gyrodinium impudium, is a unique compound comprising homogenous galactose units conjugated to uronic acid and sulfated groups. Although previous studies showed that p-KG03 suppresses tumor cell growth and infection by encephalomyocarditis virus, its effect against enveloped virus infection and the biological mechanism of action have not been elucidated. In this report, the inhibitory activity of p-KG03 against influenza virus was examined and compared with that of other sulfated polysaccharides (fucoidan and pentosan polysulfate) and antiviral agents (oseltamivir phosphate, oseltamivir carboxylate, amantadine, and ribavirin). The results of a cytopathic effect reduction assay using MDCK cells demonstrated that p-KG03 exhibited the 50% effective concentration (EC(50)) values of 0.19-0.48 μg/ml against influenza type A virus infection (selectivity index >200) but not all influenza type B viruses. Mechanism studies showed that inhibition of influenza virus replication was maximized when p-KG03 was added during or within 6 h after viral infection, suggesting that mainly the viral adsorption and internalization steps are targeted by this compound. The results of influenza virus binding assay to p-KG03 and fluorescence microscopy indicate that the antiviral activity of p-KG03 is directly associated with its interaction with viral particles. The sulfated polysaccharide p-KG03 is a potent and specific influenza A viral entry inhibitor and may be a candidate for antiviral drug development.

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The influenza B virus protein, NB, was expressed in Escherichia coli, either with a C-terminal polyhistidine tag or with NB fused to the C-terminus of glutathione S-transferase (GST), and purified by affinity chromatography. NB produced ion channel activity when added to artificial lipid bilayers separating NaCl solutions with unequal concentrations (150-500 mM cis, 50 mM trans). An antibody to a peptide mimicking the 25 residues at the C-terminal end of NB, and amantadine at high concentration (2-3 mM), both depressed ion channel activity. Ion channels had a variable conductance, the lowest conductance observed being approximately 10 picosiemens. At a pH of 5.5 to 6.5, currents reversed at positive potentials indicating that the channel was more permeable to sodium than to chloride ions (PNa/PCl approximately 9). In asymmetrical NaCl solutions at a pH of 2.5, currents reversed closer to the chloride than to the sodium equilibrium potential indicating that the channel had become more permeable to chloride than to sodium ions (PCl/PNa approximately 4). It was concluded that, at normal pHs, NB forms cation-selective channels.

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In animal models, corticosteroids are associated with changes in hippocampal structure and functioning that are prevented by glutamate release inhibitors or N-methyl-D-aspartate (NMDA) receptor antagonists. Cushing's disease and prescription corticosteroid administration are also associated with memory impairment and hippocampal atrophy. Use of NMDA receptor antagonists to attenuate corticosteroid effects in humans has not been investigated. We examine the NMDA receptor antagonist memantine in patients receiving corticosteroids.

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In patients with moderate-to-severe AD, combination treatment with the N-methyl-d-aspartate receptor antagonist memantine and the ChEI donepezil has produced significant benefits in cognition, function, behavior, global outcome, and care dependency, compared with donepezil treatment alone. Data from long-term observational studies support these findings. Compared with ChEI monotherapy, combination treatment slowed cognitive and functional decline (a 4-year sustained effect that appeared to increase over time) and reduced the risk of nursing home admission. Preclinically, the combination of N-methyl-d-aspartate receptor modulation and acetylcholinesterase inhibition has been shown to act synergistically, which may explain the observed clinical effects of combination treatment.

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symmetrel 100 mg 2015-03-19

Memantine may improve the cognitive and buy symmetrel motor impairments of PD. And it is both safe and well-tolerated.

symmetrel medication 2016-03-27

Thirty-five parkinsonian patients (five untreated, six with levodopa only, seven with levodopa plus Ro 4-4602, nine with anticholinergic and/or antihistaminic medication, and eight with the anticholinergic/antihistaminic medication plus amantadine) and 35 age-matched control subjects were studied. Platelets isolated from each individual plasma were incubated with 14C-dopamine. Uptake was found to be decreased to a significant degree in all treated or untreated parkinsonian patients when compared with control subjects. Anticholinergic and/or antihistaminic medication, with or without amantadine, further decreased the dopamine uptake into platelets, while levodopa alone or with Ro 4-4602 buy symmetrel returned uptake values to near normal. Dopamine efflux paralleled exactly the uptake values. The fact that parkinsonian platelets exhibit impaired dopamine uptake, while age-matched control platelets do not, constitutes the first direct evidence in favor of a generalized dopamine defect in Parkinson's disease.

symmetrel buy 2016-03-22

Chronic hepatitis C virus (HCV) infection affects more than 170 million persons worldwide and is responsible for the development of liver cirrhosis in many cases. Standard treatment with pegylated alpha interferon (IFN-alpha) in combination with the nucleoside analogue ribavirin leads to a sustained virologic response in approximately half of the patients. IFN-alpha is classified as an indirect treatment, as it interacts with the host's immune response. The mechanism of action of ribavirin is still unknown. The benefit of triple therapy by adding other antiviral agents, e.g., amantadine, is controversial. Currently, new direct antiviral drugs (HCV protease/polymerase inhibitors) are being evaluated in phase 1/phase 2 trials. Phenotypic resistance to antiviral therapy has been attributed to amino acid variations within distinct regions of the HCV polyprotein. While sensitivity to IFN-alpha-based antiviral therapy in vivo is clearly correlated with the number of mutations within the HCV NS5A protein, the underlying functional mechanisms for this association are unknown. In turn, in vitro, several mechanisms to circumvent the host immune defense Motilium Drug or to block treatment-induced antiviral activities have been described for different HCV proteins. By the introduction of direct antiviral drugs, hepatitis C therapy now is entering a new era in which the development of resistance may become the most important parameter for treatment success or failure.

symmetrel cost 2017-06-05

43 patients were enrolled in this prospective, randomized, parallel group Desyrel Recommended Dose study. There were no significant imbalances between the treatment groups in demographic and baseline clinical characteristics. Cognitive and global measures were collected at baseline and at the end of weeks 4, 8, 12 and 24. Behavioral measures were collected at baseline, at the end of week 12 and at week 24.

symmetrel dosage 2016-10-29

Each resident underwent a comprehensive geriatric assessment at baseline by means of the Depakote Overdose Uptodate RAI MDS 2.0. Dementia diagnosis was based on ICD-9 codes.

symmetrel generic name 2015-04-08

From May to August 2009, data of 65 patients were collected. Median age was 51 years, 57 % of the patients were female. Most patients (47) had onco-hematological cancers and 18 had solid tumors. Cancer treatment mainly consisted of chemotherapy (46), or stem cell transplantation (SCT) (16). Only 19 of 64 patients had received the 2009 seasonal Influenza vaccine. Clinical presentation included pneumonia (43) and upper respiratory tract infection (22). Forty five of 58 ambulatory patients were admitted. Mechanical ventilation was required in 12 patients (18%). Treatment included oseltamivir monotherapy or in combination with amantadine for a median of 7 days. The global 30-day mortality rate was 18%. All 12 deaths were among the non-vaccinated patients. No deaths were observed among the 19 vaccinated patients. Oxygen saturation <96% at presentation was a predictor of mortality (OR 19.5; 95%CI Aldactone Tab 25mg : 2.28 to 165.9).