Enalapril Maleate

Enalapril Maleate

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Questions & Answers

Side Effects & Adverse Reactions

Anaphylactoid and Possibly Related Reactions

Presumably because angiotensin-converting enzyme inhibitors affect the metabolism of eicosanoids and polypeptides, including endogenous bradykinin, patients receiving ACE inhibitors (including enalapril maleate) may be subject to a variety of adverse reactions, some of them serious.

Head and Neck Angioedema

Angioedema of the face, extremities, lips, tongue, glottis and/or larynx has been reported in patients treated with angiotensin-converting enzyme inhibitors, including enalapril maleate. This may occur at any time during treatment. In such cases enalapril maleate should be promptly discontinued and appropriate therapy and monitoring should be provided until complete and sustained resolution of signs and symptoms has occurred. In instances where swelling has been confined to the face and lips the condition has generally resolved without treatment, although antihistamines have been useful in relieving symptoms. Angioedema associated with laryngeal edema may be fatal. Where there is involvement of the tongue, glottis or larynx, likely to cause airway obstruction, appropriate therapy, e.g., subcutaneous epinephrine solution 1:1000 (0.3 mL to 0.5 mL) and/or measures necessary to ensure a patent airway, should be promptly provided (see ADVERSE REACTIONS).

Intestinal Angioedema

Intestinal angioedema has been reported in patients treated with ACE inhibitors. These patients presented with abdominal pain (with or without nausea or vomiting); in some cases there was no prior history of facial angioedema and C-1 esterase levels were normal. The angioedema was diagnosed by procedures including abdominal CT scan or ultrasound, or at surgery, and symptoms resolved after stopping the ACE inhibitor. Intestinal angioedema should be included in the differential diagnosis of patients on ACE inhibitors presenting with abdominal pain.

Patients with a history of angioedema unrelated to ACE inhibitor therapy may be at increased risk of angioedema while receiving an ACE inhibitor (see also INDICATIONS AND USAGE and CONTRAINDICATIONS).

Anaphylactoid Reactions During Desensitization

Two patients undergoing desensitizing treatment with hymenoptera venom while receiving ACE inhibitors sustained life-threatening anaphylactoid reactions. In the same patients, these reactions were avoided when ACE inhibitors were temporarily withheld, but they reappeared upon inadvertent rechallenge.

Anaphylactoid Reactions During Membrane Exposure

Anaphylactoid reactions have been reported in patients dialyzed with high-flux membranes and treated concomitantly with an ACE inhibitor. Anaphylactoid reactions have also been reported in patients undergoing low-density lipoprotein apheresis with dextran sulfate absorption.

Hypotension

Excessive hypotension is rare in uncomplicated hypertensive patients treated with enalapril maleate alone. Patients with heart failure given enalapril maleate commonly have some reduction in blood pressure, especially with the first dose, but discontinuation of therapy for continuing symptomatic hypotension usually is not necessary when dosing instructions are followed; caution should be observed when initiating therapy (see DOSAGE AND ADMINISTRATION). Patients at risk for excessive hypotension, sometimes associated with oliguria and/or progressive azotemia, and rarely with acute renal failure and/or death, include those with the following conditions or characteristics: heart failure, hyponatremia, high dose diuretic therapy, recent intensive diuresis or increase in diuretic dose, renal dialysis, or severe volume and/or salt depletion of any etiology. It may be advisable to eliminate the diuretic (except in patients with heart failure), reduce the diuretic dose or increase salt intake cautiously before initiating therapy with enalapril maleate in patients at risk for excessive hypotension who are able to tolerate such adjustments (see PRECAUTIONS, Drug Interactions and ADVERSE REACTIONS). In patients at risk for excessive hypotension, therapy should be started under very close medical supervision and such patients should be followed closely for the first 2 weeks of treatment and whenever the dose of enalapril and/or diuretic is increased. Similar considerations may apply to patients with ischemic heart or cerebrovascular disease, in whom an excessive fall in blood pressure could result in a myocardial infarction or cerebrovascular accident.

If excessive hypotension occurs, the patient should be placed in the supine position and, if necessary, receive an intravenous infusion of normal saline. A transient hypotensive response is not a contraindication to further doses of enalapril maleate, which usually can be given without difficulty once the blood pressure has stabilized. If symptomatic hypotension develops, a dose reduction or discontinuation of enalapril maleate or concomitant diuretic may be necessary.

Neutropenia/Agranulocytosis

Another angiotensin-converting enzyme inhibitor, captopril, has been shown to cause agranulocytosis and bone marrow depression, rarely in uncomplicated patients but more frequently in patients with renal impairment especially if they also have a collagen vascular disease. Available data from clinical trials of enalapril are insufficient to show that enalapril does not cause agranulocytosis at similar rates. Marketing experience has revealed cases of neutropenia or agranulocytosis in which a causal relationship to enalapril cannot be excluded. Periodic monitoring of white blood cell counts in patients with collagen vascular disease and renal disease should be considered.

Hepatic Failure

Rarely, ACE inhibitors have been associated with a syndrome that starts with cholestatic jaundice and progresses to fulminant hepatic necrosis, and (sometimes) death. The mechanism of this syndrome is not understood. Patients receiving ACE inhibitors who develop jaundice or marked elevations of hepatic enzymes should discontinue the ACE inhibitor and receive appropriate medical follow-up.

Fetal Toxicity
Pregnancy Category D

Use of drugs that act on the renin-angiotensin system during the second and third trimesters of pregnancy reduces fetal renal function and increases fetal and neonatal morbidity and death. Resulting oligohydramnios can be associated with fetal lung hypoplasia and skeletal deformations. Potential neonatal adverse effects include skull hypoplasia, anuria, hypotension, renal failure and death. When pregnancy is detected, discontinue enalapril maleate as soon as possible. These adverse outcomes are usually associated with use of these drugs in the second and third trimester of pregnancy. Most epidemiologic studies examining fetal abnormalities after exposure to antihypertensive use in the first trimester have not distinguished drugs affecting the renin-angiotensin system from other antihypertensive agents. Appropriate management of maternal hypertension during pregnancy is important to optimize outcomes for both mother and fetus.

In the unusual case that there is no appropriate alternative to therapy with drugs affecting the renin-angiotensin system for a particular patient, apprise the mother of the potential risk to the fetus. Perform serial ultrasound examinations to assess the intra-amniotic environment. If oligohydramnios is observed, discontinue enalapril maleate, unless it is considered lifesaving for the mother. Fetal testing may be appropriate, based on the week of pregnancy. Patients and physicians should be aware, however, that oligohydramnios may not appear until after the fetus has sustained irreversible injury. Closely observe infants with histories of in utero exposure to enalapril maleate for hypotension, oliguria and hyperkalemia (see PRECAUTIONS, Pediatric Use).

No teratogenic effects of enalapril were seen in studies of pregnant rats and rabbits. On a body surface area basis, the doses used were 57 times and 12 times, respectively, the maximum recommended human daily dose (MRHDD).

Legal Issues

There is currently no legal information available for this drug.

FDA Safety Alerts

There are currently no FDA safety alerts available for this drug.

Manufacturer Warnings

There is currently no manufacturer warning information available for this drug.

FDA Labeling Changes

There are currently no FDA labeling changes available for this drug.

Uses

Hypertension

Enalapril maleate tablets, USP are indicated for the treatment of hypertension.

Enalapril maleate tablets, USP are effective alone or in combination with other antihypertensive agents, especially thiazide-type diuretics. The blood pressure lowering effects of enalapril maleate and thiazides are approximately additive.

Heart Failure

Enalapril maleate tablets. USP are indicated for the treatment of symptomatic congestive heart failure, usually in combination with diuretics and digitalis. In these patients enalapril maleate tablets improve symptoms, increases survival, and decreases the frequency of hospitalization (see CLINICAL PHARMACOLOGY: Heart Failure, Mortality Trials for details and limitations of survival trials).

Asymptomatic Left Ventricular Dysfunction

In clinically stable asymptomatic patients with left ventricular dysfunction (ejection fraction ≤ 35%), enalapril maleate tablets, USP decrease the rate of development of overt heart failure and decrease the incidence of hospitalization for heart failure (see CLINICAL PHARMACOLOGY: Heart Failure, Mortality Trials for details and limitations of survival trials).

In using enalapril maleate, consideration should be given to the fact that another angiotensin-converting enzyme inhibitor, captopril, has caused agranulocytosis, particularly in patients with renal impairment or collagen vascular disease, and that available data are insufficient to show that enalapril maleate does not have a similar risk (see WARNINGS)

In considering use of enalapril maleate, it should be noted that in controlled clinical trials ACE inhibitors have an effect on blood pressure that is less in black patients than in nonblacks. In addition, it should be noted that black patients receiving ACE inhibitors have been reported to have a higher incidence of angioedema compared to nonblacks (see WARNINGS, Head and Neck Angioedema).

History

There is currently no drug history available for this drug.

Other Information

Enalapril maleate is the maleate salt of enalapril, the ethyl ester of a long-acting angiotensin-converting enzyme inhibitor, enalaprilat. Enalapril maleate is chemically described as (S)-1-[N-[1-(ethoxycarbonyl)-3-phenylpropyl]-L-alanyl]-L-proline, (Z)-2-butenedioate salt (1:1). Its molecular formula is C20H28N2O5∙C4H4O4, and its structural formula is:

Structural formula

Enalapril maleate is a white to off-white, crystalline powder with a molecular weight of 492.53. It is sparingly soluble in water, soluble in ethanol, and freely soluble in methanol.

Enalapril is a pro-drug; following oral administration, it is bioactivated by hydrolysis of the ethyl ester to enalaprilat, which is the active angiotensin-converting enzyme inhibitor.

Enalapril maleate is supplied as 2.5 mg, 5 mg, 10 mg, and 20 mg tablets for oral administration. In addition to the active ingredient enalapril maleate, each tablet contains the following inactive ingredients: corn starch, croscarmellose sodium, lactose monohydrate, magnesium stearate, pregelatinized starch, and sodium bicarbonate. In addition, the 2.5 mg tablets contain ferric oxide yellow, 5 mg tablets contain ferric oxide red and 10 mg and 20 mg tablets contain ferric oxide red and ferric oxide black.

Enalapril Maleate Manufacturers


  • Sandoz Inc
    Enalapril Maleate Tablet [Sandoz Inc]
  • Oceanside Pharmaceuticals
    Enalapril Maleate Tablet [Oceanside Pharmaceuticals]
  • Blenheim Pharmacal, Inc.
    Enalapril Maleate Tablet [Blenheim Pharmacal, Inc.]
  • Blenheim Pharmacal, Inc.
    Enalapril Maleate Tablet [Blenheim Pharmacal, Inc.]
  • Northwind Pharmaceuticals, Llc
    Enalapril Maleate Tablet [Northwind Pharmaceuticals, Llc]
  • Watson Laboratories Inc.
    Enalapril Maleate (Enalapril Maleate) Tablet [Watson Laboratories Inc.]
  • Apace Packaging
    Enalapril Maleate Tablet, Soluble [Apace Packaging]
  • Contract Pharmacy Services-pa
    Enalapril Maleate Tablet [Contract Pharmacy Services-pa]
  • Contract Pharmacy Services-pa
    Enalapril Maleate Tablet [Contract Pharmacy Services-pa]
  • State Of Florida Doh Central Pharmacy
    Enalapril Maleate Tablet [State Of Florida Doh Central Pharmacy]
  • State Of Florida Doh Central Pharmacy
    Enalapril Maleate Tablet [State Of Florida Doh Central Pharmacy]
  • Rebel Distributors Corp
    Enalapril Maleate Tablet [Rebel Distributors Corp]
  • Med Health Pharma, Llc
    Enalapril Maleate Tablet [Med Health Pharma, Llc]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • American Health Packaging
    Enalapril Maleate Tablet [American Health Packaging]
  • Bryant Ranch Prepack
    Enalapril Maleate Tablet [Bryant Ranch Prepack]
  • Bryant Ranch Prepack
    Enalapril Maleate Tablet [Bryant Ranch Prepack]
  • Physicians Total Care, Inc.
    Enalapril Maleate Tablet [Physicians Total Care, Inc.]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Pd-rx Pharmaceuticals, Inc.
    Enalapril Maleate (Enalapril Maleate) Tablet [Pd-rx Pharmaceuticals, Inc.]
  • Major Pharmaceuticals
    Enalapril Maleate Tablet [Major Pharmaceuticals]
  • Taro Pharmaceuticals U.s.a., Inc.
    Enalapril Maleate Tablet [Taro Pharmaceuticals U.s.a., Inc.]
  • Stat Rx Usa Llc
    Enalapril Maleate Tablet [Stat Rx Usa Llc]
  • Dispensing Solutions, Inc.
    Enalapril Maleate Tablet [Dispensing Solutions, Inc.]
  • Pd-rx Pharmaceuticals, Inc.
    Enalapril Maleate Tablet [Pd-rx Pharmaceuticals, Inc.]
  • Pd-rx Pharmaceuticals, Inc.
    Enalapril Maleate Tablet [Pd-rx Pharmaceuticals, Inc.]
  • Remedyrepack Inc.
    Enalapril Maleate (Enalapril Maleate ) Tablet [Remedyrepack Inc. ]
  • Golden State Medical Supply, Inc.
    Enalapril Maleate Tablet [Golden State Medical Supply, Inc.]
  • Ncs Healthcare Of Ky, Inc Dba Vangard Labs
    Enalapril Maleate Tablet [Ncs Healthcare Of Ky, Inc Dba Vangard Labs]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Legacy Pharmaceutical Packaging
    Enalapril Maleate Tablet [Legacy Pharmaceutical Packaging]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Cardinal Health
    Enalapril Maleate Tablet [Cardinal Health]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Unit Dose Services
    Enalapril Maleate Tablet [Unit Dose Services]
  • Unit Dose Services
    Enalapril Maleate Tablet [Unit Dose Services]
  • Unit Dose Services
    Enalapril Maleate Tablet [Unit Dose Services]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Unit Dose Services
    Enalapril Maleate Tablet [Unit Dose Services]
  • Unit Dose Services
    Enalapril Maleate Tablet [Unit Dose Services]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Lake Erie Medical Dba Quality Care Products Llc
    Enalapril Maleate Tablet [Lake Erie Medical Dba Quality Care Products Llc]
  • Lake Erie Medical Dba Quality Care Products Llc
    Enalapril Maleate Tablet [Lake Erie Medical Dba Quality Care Products Llc]
  • Teva Pharmaceuticals Usa Inc
    Enalapril Maleate Tablet [Teva Pharmaceuticals Usa Inc]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Wockhardt Usa Llc.
    Enalapril Maleate Tablet [Wockhardt Usa Llc.]
  • Wockhardt Limited
    Enalapril Maleate Tablet [Wockhardt Limited]
  • St Marys Medical Park Pharmacy
    Enalapril Maleate (Enalapril Maleate) Tablet [St Marys Medical Park Pharmacy]
  • Preferred Pharmaceuticals, Inc.
    Enalapril Maleate Tablet [Preferred Pharmaceuticals, Inc.]
  • State Of Florida Doh Central Pharmacy
    Enalapril Maleate Tablet [State Of Florida Doh Central Pharmacy]
  • Taro Pharmaceuticals U.s.a., Inc.
    Enalapril Maleate Tablet [Taro Pharmaceuticals U.s.a., Inc.]
  • Golden State Medical Supply, Inc.
    Enalapril Maleate Tablet [Golden State Medical Supply, Inc.]
  • St Marys Medical Park Pharmacy
    Enalapril Maleate Tablet [St Marys Medical Park Pharmacy]
  • Mylan Pharmaceuticals Inc.
    Enalapril Maleate Tablet Enalapril Maleate Tablet [Mylan Pharmaceuticals Inc.]
  • Remedyrepack Inc.
    Enalapril Maleate Tablet [Remedyrepack Inc. ]
  • Bryant Ranch Prepack
    Enalapril Maleate Tablet [Bryant Ranch Prepack]
  • Cardinal Health
    Enalapril Maleate Tablet [Cardinal Health]
  • Mylan Institutional Inc.
    Enalapril Maleate Tablet Enalapril Maleate Tablet [Mylan Institutional Inc.]
  • Tya Pharmaceuticals
    Enalapril Maleate Tablet [Tya Pharmaceuticals]

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