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Generic Symmetrel Amantadine 100mg

Symmetrel (Amantadine Hydrochloride, USP) is indicated for chemoprophylaxis against signs and symptoms of influenza A virus infection when early vaccination is not feasible or when the vaccine is contraindicated or not available. In the prophylaxis of influenza, early vaccination on an annual basis as recommended by the Centers for Disease Control's Immunization Practices Advisory Committee is the method of choice. You ought to accompany this drug with a glass of water.

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Symmetrel Precautions

Symmetrel should not be discontinued abruptly in patients with Parkinson's disease since a few patients have experienced a parkinsonian crisis, i.e., a sudden marked clinical deterioration, when this medication was suddenly stopped. The dose of anticholinergic drugs or of Symmetrel should be reduced if atropine-like effects appear when these drugs are used concurrently. NMS is an uncommon but life-threatening syndrome characterized by fever or hyperthermia; neurologic findings including muscle rigidity, involuntary movements, altered consciousness; mental status changes; other disturbances such as autonomic dysfunction, tachycardia, tachypnea, hyper- or hypotension; laboratory findings such as creatine phosphokinase elevation, leukocytosis, myoglobinuria, and increased serum myoglobin.

Symmetrel Adverse Reactions

Sporadic cases of possible Neuroleptic Malignant Syndrome (NMS) have been reported in association with dose reduction or withdrawal of Symmetrel therapy. Therefore, patients should be observed carefully when the dosage of Symmetrel is reduced abruptly or discontinued, especially if the patient is receiving neuroleptics. The dose of Symmetrel may need careful adjustment in patients with congestive heart failure, peripheral edema, or orthostatic hypotension.

Symmetrel Overdosage

Careful observation is required when Symmetrel is administered concurrently with central nervous system stimulants. Agents with anticholinergic properties may potentiate the anticholinergic-like side effects of amantadine. Coadministration of thioridazine has been reported to worsen the tremor in elderly patients with Parkinson's disease, however, it is not known if other phenothiazines produce a similar response. Coadministration of Dyazide (triamterene/hydrochlorothiazide) resulted in a higher plasma amantadine concentration in a 61-year-old man receiving Symmetrel (Amantadine Hydrochloride, USP) 100 mg TID for Parkinson's disease.

The effect of amantadine on fertility has not been adequately tested, that is, in a study conducted under Good Laboratory Practice (GLP) and according to current recommended methodology. In a three litter, non-GLP, reproduction study in rats, Symmetrel at a dose of 32 mg/kg/day (equal to the maximum recommended human dose on a mg/m2 basis) administered to both males and females slightly impaired fertility. Infrequently (0.1-1%) occurring adverse reactions are: congestive heart failure, psychosis, urinary retention, dyspnea, skin rash, vomiting, weakness, slurred speech, euphoria, thinking abnormality, amnesia, hyperkinesia, hypertension, decreased libido, and visual disturbance, including punctate subepithelial or other corneal opacity, corneal edema, decreased visual acuity, sensitivity to light, and optic nerve palsy.

Pulmonary edema and respiratory distress (including adult respiratory distress syndrome - ARDS) have been reported; renal dysfunction including increased BUN, decreased creatinine clearance and renal insufficiency can occur. Central nervous system effects that have been reported include insomnia, anxiety, agitation, aggressive behavior, hypertonia, hyperkinesia, ataxia, gait abnormality, tremor, confusion, disorientation, depersonalization, fear, delirium, hallucinations, psychotic reactions, lethargy, somnolence and coma. Seizures may be exacerbated in patients with prior history of seizure disorders. Hyperthermia has also been observed in cases where a drug overdose has occurred.