Enalapril / hydrochlorothiazide Side Effects
Not all side effects for enalapril / hydrochlorothiazide may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
For the Consumer
Applies to enalapril / hydrochlorothiazide: oral tablet
In addition to its needed effects, some unwanted effects may be caused by enalapril / hydrochlorothiazide. In the event that any of these side effects do occur, they may require medical attention.
You should check with your doctor immediately if any of these side effects occur when taking enalapril / hydrochlorothiazide:Less common
- Blurred vision
- chest pain or discomfort
- cold sweats
- decreased urine output
- dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
- dry mouth
- fast, slow, or irregular heartbeat
- increased thirst
- loss of appetite
- muscle pain or cramps
- nausea or vomiting
- numbness or tingling in the hands, feet, or lips
- rapid breathing
- shortness of breath
- sunken eyes
- swelling of the face, ankles, or hands
- unusual tiredness or weakness
- weak pulse
- wrinkled skin
Some of the side effects that can occur with enalapril / hydrochlorothiazide may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:Less common
- decreased interest in sexual intercourse
- inability to have or keep an erection
- lack or loss of strength
- loss in sexual ability, desire, drive, or performance
For Healthcare Professionals
Applies to enalapril / hydrochlorothiazide: oral tablet
Predisposing risk factors for hypotension after enalapril-HCTZ administration are decreased intravascular volume (angiotensin-dependency) and hyponatremia.
Cardiovascular complications are among the most common. Hypotension occurs in approximately 2% to 8%, and is more common in patients with hypovolemia. This can result in syncope in 1% to 4% of patients. Hypokalemia associated with hydrochlorothiazide (HCTZ) monotherapy has been associated with rare cases of cardiac arrhythmias, including ventricular ectopy and complete AV heart block. Chest pain has been reported in up to 5% of patients who are receiving enalapril.
Since HCTZ may increase total serum cholesterol by 11%, LDL lipoprotein cholesterol by 12%, and VLDL lipoprotein cholesterol levels by 50%, and may reduce insulin secretion, it should be used with caution in diabetic patients and in those with hypercholesterolemia. Indeed, rare cases of hyperosmolar hyperglycemic coma are associated with HCTZ.
Hyperuricemia may be an important consideration in patients with a history of gout. Hypophosphatemia and low serum magnesium concentrations may occur, but are usually clinically insignificant except in malnourished patients.
Metabolic side effects, such as hypokalemia, hyponatremia, hypomagnesemia, and hyperuricemia are common during HCTZ therapy, especially when doses greater than 50 mg per day are used. Mild hypokalemia (decrease of 0.5 mEq/L) occurs in up to 50% of patients taking HCTZ alone; this is less likely with the combination drug because enalapril attenuates the aldosteronism associated with thiazide diuretics. Metabolic alkalosis, hypercalcemia, hyperglycemia, and hypercholesterolemia have been associated with the use of HCTZ.
Renal side effects including renal insufficiency has been associated with both the use of enalapril and HCTZ, and is, therefore, a problem with the combination product. Enalapril-associated renal failure is more likely in patients with "high angiotensin states" (congestive heart failure, edema, renal artery stenosis, hypovolemia, hypotension, or chronic renal failure). Rare cases of interstitial nephritis have been associated with HCTZ.
Enalapril, like other angiotensin converting enzyme inhibitors, may decrease serum aldosterone levels, resulting in mild to moderate hyperkalemia.
Although HCTZ has been used to treat nephrogenic diabetes insipidus, a case report in which the drug was believed to have caused this condition is reported.
Hepatic side effects associated with the use of ACE inhibitors have included a rare syndrome that begins with cholestatic jaundice and progresses to fulminant hepatic necrosis and (sometimes) death. Experts recommend discontinuation of therapy with this drug if jaundice or markedly elevated hepatic serum enzymes develop. Both cholestatic jaundice and centrilobular necrosis have been described.
Rare case reports of enalapril-associated hepatitis, where liver function tests rose despite resolution of congestive heart failure, are reported.
A 54-year-old woman with hypertension developed asymptomatic abnormal liver function tests associated with eosinophilia and relatively normal abdominal ultrasonography seven weeks after beginning enalapril. An extensive work-up revealed no evidence of infection; liver biopsy revealed cellular degeneration, portal eosinophilic and mononuclear infiltration, and centrilobular necrosis. The signs and symptoms of hepatitis resolved upon discontinuation of enalapril.
Late-onset enalapril-induced angioedema (more than three months) is reported in at least one patient who had taken enalapril without incident for three years. Patients with intestinal angioedema generally present with abdominal pain (with or without nausea or vomiting) and in some cases there was no prior history of facial angioedema, and C-1 esterase levels were normal. These symptoms resolve after stopping the ACE inhibitor.
A 68-year-old man with a history of myocardial infarction (MI) developed dyspnea, chest tightness, a low grade fever, dizziness, sweating, and vomiting associated with cyanosis, a mild leukocytosis, radiographic evidence of pulmonary edema, clinical evidence of hypovolemia, and respiratory acidosis. MI and infection were ruled out; the patient recovered after restoration of his intravascular volume with saline and albumin. The only precipitating factor per history was taking HCTZ, which the patient had taken without incident for two years. Rechallenge with the drug resulted in recurrent acute pulmonary edema. Other signs of hypersensitivity, such as rash and eosinophilia, were absent.
Hypersensitivity reactions to enalapril, as with some other angiotensin converting enzyme (ACE) inhibitors, may be life-threatening. Angioedema of the face, extremities, lips, tongue, glottis and/or pharynx have been reported rarely in patients receiving ACE inhibitors. Obstructive laryngeal and glossal angioedema due to enalapril is a rare, but potentially fatal reaction. In addition, intestinal angioedema has been reported in patients treated with ACE inhibitors. It is recommended that any patient with dyspnea, dysphagia, or significant facial angioedema stop therapy immediately and avoid ACE inhibitor therapy in general. Enalapril is not recommended for patients with a history of idiopathic angioedema.
Other hypersensitivity reactions associated with enalapril including photosensitivity in 0.1%, or urticaria in 0.3% of patients have been reported. A single case of Henoch-Schonlein purpura has also been reported.
Rare cases of acute pulmonary edema, interstitial cystitis, interstitial nephritis, and anaphylaxis have been associated with HCTZ.
Respiratory system side effects are remarkable for a dry, nonproductive cough that has usually become a problem for 1% to 5% of patients who are receiving enalapril alone. Some patients with enalapril-induced cough demonstrate new bronchial hyper-reactivity. Less common respiratory system side effects include rhinorrhea associated with enalapril (thought to be due to the effect of enalapril on vasodilating kinins) and approximately 30 case reports of acute noncardiogenic pulmonary edema associated with HCTZ (thought to be due to idiosyncrasy or a hypersensitivity mechanism).
Rare case reports of asthma associated with some angiotensin converting enzyme inhibitors suggest that these drugs seem to play a role in the genesis and metabolism of bronchodilatory mediators. For this reason, some experts recommend cautious use of enalapril in patients with preexisting asthma.
A retrospective study has revealed a significantly higher incidence of discontinuation of angiotensin converting enzyme inhibitor therapy due to cough among black patients compared with non-black patients (9.6% vs. 2.4%).
Hematologic side effects are extremely rare with either drug. Discontinuation of enalapril due to anemia has been reported in less than 0.1% of patients. Rare cases of neutropenia and agranulocytosis have been associated with enalapril and rare cases of immune-complex hemolytic anemia, aplastic anemia, and thrombocytopenia have been associated with HCTZ.
An 83-year-old woman with a history of hypertension, angina pectoris, coronary artery disease, and myocardial infarction developed fever associated with profound neutropenia and an E. coli urinary tract infection six months after beginning enalapril. Bone marrow aspiration revealed only a few myeloid progenitors, but normal erythropoiesis and megakaryocytic differentiation. The agranulocytosis resolved once enalapril was discontinued.
Nervous system side effects including headache is the most common. Headache occurs in 3% to 12% of patients. Other nervous system complaints, such as vertigo, fatigue, paresthesias, and insomnia have only rarely been reported. A single case of cerebrovascular insufficiency has been associated with HCTZ-induced plasma volume contraction.
Dermatologic side effects have been associated with the use of both ACE inhibitors and thiazide diuretics. Thiazides may induce phototoxic dermatitis. In addition, a rare, distinct entity with clinical and laboratory features indistinguishable from those of subacute cutaneous lupus erythematosus has been associated with HCTZ. Other dermatologic reactions include rare reports of erythema annular centrifugum, acute eczematous dermatitis, morbilliform and leukocytoclastic vasculitis associated with HCTZ, and alopecia, photosensitive lichenoid eruptions, erythema with vasculitis, bullous pemphigoid, and pemphigus foliaceus associated with enalapril.
A 52-year-old Korean woman with hypertension experienced a generalized, erythematous, scaly rash associated with a positive Nikolsky sign and biopsy results consistent with pemphigus foliaceus within three weeks after beginning enalapril. Direct immunofluorescence revealed intercellular IgG deposition. The pemphigus remained active at least 12 months after enalapril was discontinued.
A 67-year-old white woman with hypothyroidism, hypercalcemia, depression, and hypertension developed facial erythema, headaches, tremors, confusion, and personality changes associated with a new positive ANA and anti-nRNP, and skin biopsy consistent with lupus erythematosus while taking HCTZ, levothyroxine, and amitriptyline. The eruption resolved upon discontinuation of HCTZ, but she later developed a higher ANA titer associated with symptomatic diffuse interstitial pulmonary infiltrates. She was successfully treated with corticosteroids.
A 35-year-old woman with hypertension developed alopecia during enalapril therapy, which resolved upon discontinuation of the drug, and recurred upon rechallenge.
A 56-year-old woman with hypertension and diabetes developed acute abdominal pain, nausea, and vomiting associated upper abdominal tenderness, hyperamylasemia, hyperlipasemia, and normal upper abdominal ultrasonography within 24 hours of starting enalapril. The signs and symptoms of pancreatitis resolved over the next several days once the drug was discontinued. No rechallenge was performed.
Thiazide diuretics may increase serum cholesterol and triglycerides, resulting in increased risk of cholesterol gallstone formation. Reports of bowel strictures associated with thiazide ingestion have been reported in the 1960's, although these patients were on a combination HCTZ-potassium product.
Gastrointestinal side effects are unusual. Nausea, vomiting, or diarrhea have each been reported in less than 3% of patients who are receiving enalapril. Dysgeusia is rare, occurring in less than 0.5% of patients. Rare cases of acute small bowel mucosal edema, acute cholecystitis, or pancreatitis have been associated with either drug.
There are rare case reports of HCTZ-induced immune hemolytic anemia. The following illustrates a fatal case:
A 53-year-old man with hypertension developed nausea, vomiting, diarrhea, and progressive anorexia and weakness associated with scleral icterus, anemia with spherocytosis, dark red urine with proteinuria, bilirubinuria, hemoglobinuria, and elevated lactic dehydrogenase levels 18 months after beginning HCTZ and methyldopa. Haptoglobin was less than 50 mg/dl. Direct and indirect Coombs' tests were positive. The patient died suddenly; autopsy revealed no obvious cause of death, left ventricular hypertrophy, and mild coronary atherosclerosis.
Immunologic side effects have been reported in a limited study of nine elderly patients, three of whom developed a positive fluorescent antinuclear antibody test during six weeks of enalapril therapy. Allergic vasculitis and hemolytic anemia have rarely been associated with HCTZ.
A 76-year-old woman with hypertension, on enalapril monotherapy for three weeks, developed progressive myalgias, asthenia, morning stiffness, and weakness associated with no abnormal laboratory values. Due to the absence of other apparent causes, enalapril was discontinued, and the patient's myalgias disappeared.
Musculoskeletal side effects are unusual and include case reports of myalgias and chills.
Endocrinologic problems associated with thiazide diuretics include glucose intolerance and a potentially deleterious effect on the lipid profile. This may be important in some patients with or who are at risk for diabetes or coronary artery disease. A single case of recurrent parathyroid adenoma has been reported, although the association is probably coincidental. The only reported endocrinologic side effects associated with the use of enalapril include one case of the syndrome of inappropriate antidiuretic hormone secretion (SIADH) and three cases of glycosuria.
A 69-year-old woman with diabetes mellitus and hypertension developed symptomatic hyponatremia associated with decreased plasma and increased urine osmolalities, normal thyroid and basal cortisol studies, and a positive water load test four months after beginning enalapril. The syndrome resolved upon discontinuation of enalapril, and recurred upon rechallenge.
A prospective study of 34 patients who received oral thiazide diuretics for 14 years without interruption revealed an increased mean fasting blood glucose level after treatment. Withdrawal of thiazide therapy for seven months in 10 of the patients resulted in average reductions of 10% in fasting blood glucose and 25% in the 2-hour glucose tolerance test value. A control group was not reported.
A 52-year-old woman with hypertension and a history of depression associated with the use of beta-blockers, developed fatigue, malaise, and clinical signs and symptoms of depression, including suicidal ideation, within five weeks after starting enalapril. The depression gradually resolved with substitution of a thiazide diuretic and a low sodium diet. Rechallenge resulted in recurrent depression.
A 41-year-old man with hypertension became agitated, anxious, depressed, and unable to sleep four weeks after starting enalapril. The psychosis resolved when enalapril was stopped, and recurred upon rechallenge.
Psychiatric problems associated with the use of enalapril include rare cases of depression and acute psychosis.
Genitourinary side effects including rare reports of vulvovaginal pruritus, dysuria, and incontinence have been associated with the use of enalapril in an elderly patient.
Ocular side effects have included idiosyncratic reactions to the hydrochlorothiazide component resulting in acute transient myopia and acute angle-closure glaucoma.
More about enalapril/hydrochlorothiazide
- Hydrochlorothiazide and enalapril
- Enalapril and hydrochlorothiazide (Advanced Reading)
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