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Trandate

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Trandate

Trandate

OVERDOSE

Overdosage with labetalol HCl causes excessive hypotension that is posture sensitive and, sometimes, excessive bradycardia. Patients should be placed supine and their legs raised if necessary to improve the blood supply to the brain. If overdosage with labetalol HCl follows oral ingestion, gastric lavage or pharmacologically induced emesis (using syrup of ipecac) may be useful for removal of the drug shortly after ingestion. The following additional measures should be employed if necessary:

Excessive bradycardia-administer atropine or epinephrine.

Cardiac failure-administer a digitalis glycoside and a diuretic. Dopamine or dobutamine may also be useful.

Hypotension-administer vasopressors, e.g., norepinephrine. There is pharmacologic evidence that norepinephrine may be the drug of choice.

Bronchospasm-administer epinephrine and/or an aerosolized beta2-agonist.

Seizures-administer diazepam.

In severe beta-blocker overdose resulting in hypotension and/or bradycardia, glucagon has been shown to be effective when administered in large doses (5 to 10 mg rapidly over 30 seconds, followed by continuous infusion of 5 mg per hour that can be reduced as the patient improves).

Neither hemodialysis nor peritoneal dialysis removes a significant amount of labetalol HCl from the general circulation ( < 1%).

The oral LD50 value of labetalol HCl in the mouse is approximately 600 mg/kg and in the rat is > 2 g/kg. The IV LD50 in these species is 50 to 60 mg/kg.

CONTRAINDICATIONS

Trandate (labetalol) Tablets are contraindicated in bronchial asthma, overt cardiac failure, greater-than-first-degree heart block, cardiogenic shock, severe bradycardia, other conditions associated with severe and prolonged hypotension, and in patients with a history of hypersensitivity to any component of the product (see WARNINGS).

Beta-blockers, even those with apparent cardioselectivity, should not be used in patients with a history of obstructive airway disease, including asthma.

Last reviewed on RxList: 1/3/2011
This monograph has been modified to include the generic and brand name in many instances.

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