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To obtain up-to-date information about the treatment of overdose, a good resource is a certified Regional Poison Control Center. Telephone numbers of certified poison control centers are listed in the Physicians' Desk Reference (PDR). In managing overdose, consider the possibilities of multiple-drug overdoses, drug-drug interactions, and unusual drug kinetics in your patient.
No specific information is available on the treatment of overdosage with MONOPRIL-HCT (fosinopril sodium-hydrochlorothiazide tablets); treatment should be symptomatic and supportive. Therapy with MONOPRIL-HCT should be discontinued, and the patient should be observed. Dehydration, electrolyte imbalance, and hypotension should be treated by established procedures.
In rats, single oral doses of 2600 mg/kg of fosinopril were associated with significant lethality. In single-dose studies of hydrochlorothiazide, most rats survived doses of up to 2750 mg/kg. Both doses are more than 6000 times (on a mg/kg basis) the maximum recommended daily dose of either fosinopril or hydrochlorothiazide in MONOPRIL-HCT.
Data from human overdoses of fosinopril are scanty, but the most common manifestation of human fosinopril overdosage is likely to be hypotension. In human hydrochlorothiazide overdose, the most common signs and symptoms observed have been those of dehydration and electrolyte depletion (hypokalemia, hypochloremia, hyponatremia). If digitalis has also been administered, hypokalemia may accentuate cardiac arrhythmias.
Laboratory determinations of serum levels of fosinopril and its metabolites are not widely available, and such determinations have, in any event, no established role in the management of fosinopril overdose. No data are available to suggest physiological maneuvers (e.g., maneuvers to change the pH of the urine) that might accelerate elimination of fosinopril and its metabolites. Fosinoprilat is poorly removed from the body by hemodialysis or peritoneal dialysis.
Angiotensin II could presumably serve as a specific antagonist-antidote in the setting of fosinopril overdose, but angiotensin II is essentially unavailable outside of scattered research facilities. Because the hypotensive effect of fosinopril is achieved through vasodilation and effective hypovolemia, it is reasonable to treat fosinopril overdose by infusion of normal saline solution.
MONOPRIL-HCT is contraindicated in patients who are anuric. MONOPRIL-HCT is also contraindicated in patients who are hypersensitive to fosinopril, to any other ACE inhibitor, to hydrochlorothiazide, or other sulfonamide-derived drugs, or any other ingredient or component in the formulation. Hypersensitivity reactions are more likely to occur in patients with a history of allergy or bronchial asthma.This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 7/1/2009
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