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Signs and Symptoms
Signs and symptoms of acute overdosage, resulting principally from overstimulation of the central nervous system and from excessive sympathomimetic effects, may include the following: vomiting, agitation, tremors, hyperreflexia, muscle twitching, convulsions (may be followed by coma), euphoria, confusion, hallucinations, delirium, sweating, flushing, headache, hyperpyrexia, tachycardia, palpitations, cardiac arrhythmias, hypertension, mydriasis, and dryness of mucous membranes.
Poison Control Center
Consult with a Certified Poison Control Center regarding treatment for up-to-date guidance and advice.
As with the management of all overdosage, the possibility of multiple drug ingestion should be considered.
When treating overdose, practitioners should bear in mind that there is a prolonged release of methylphenidate from Ritalin LA® (methylphenidate hydrochloride) extended-release capsules.
Treatment consists of appropriate supportive measures. The patient must be protected against self-injury and against external stimuli that would aggravate overstimulation already present. Gastric contents may be evacuated by gastric lavage as indicated. Before performing gastric lavage, control agitation and seizures if present and protect the airway. Other measures to detoxify the gut include administration of activated charcoal and a cathartic. Intensive care must be provided to maintain adequate circulation and respiratory exchange; external cooling procedures may be required for hyperpyrexia.
Efficacy of peritoneal dialysis or extracorporeal hemodialysis for methylphenidate overdosage has not been established; also, dialysis is considered unlikely to be of benefit due to the large volume of distribution of methylphenidate.
Ritalin LA® (methylphenidate hydrochloride) extended-release capsules is contraindicated in marked anxiety, tension, and agitation, since the drug may aggravate these symptoms.
Hypersensitivity to Methylphenidate
Ritalin LA is contraindicated in patients known to be hypersensitive to methylphenidate or other components of the product.
Ritalin LA is contraindicated in patients with glaucoma.
Monoamine Oxidase Inhibitors
Ritalin LA is contraindicated during treatment with monoamine oxidase inhibitors, and also within a minimum of 14 days following discontinuation of treatment with a monoamine oxidase inhibitor (hypertensive crises may result).This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 6/14/2013
Additional Ritalin LA Information
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