1. Name Of The Medicinal Product
Enalapril maleate 5 mg Tablets
2. Qualitative And Quantitative Composition
Each tablet contains 5mg of Enalapril maleate.
For excipients, see 6.1
3. Pharmaceutical Form
Tablet.
White circular biplanar uncoated tablets with 5 embossed on one face and score line on the other.
4. Clinical Particulars
4.1 Therapeutic Indications
Treatment of Hypertension
• Treatment of Symptomatic Heart Failure
• Prevention of Symptomatic Heart Failure in patients with Asymptomatic Left Ventricular Dysfunction (ejection fraction
(See Section 5.1)
4.2 Posology And Method Of Administration
The absorption of Enalapril 5mg Tablets is not affected by food.
The dose should be individualised according to patient profile (see 4.4 'Special warnings and precautions for use') and blood pressure response.
Hypertension
The initial dose is 5 to maximally 20 mg, depending on the degree of hypertension and the condition of the patient (see below). Enalapril 5mg Tablets are given once daily. In mild hypertension, the recommended initial dose is 5 to 10 mg. Patients with a strongly activated renin-angiotensin- aldosterone system (e.g., renovascular hypertension, salt and/or volume depletion, cardiac decompensation, or severe hypertension) may experience an excessive blood pressure fall following the initial dose. A starting dose of 5 mg or lower is recommended in such patients and the initiation of treatment should take place under medical supervision.
Prior treatment with high dose diuretics may result in volume depletion and a risk of hypotension when initiating therapy with enalapril. A starting dose of 5 mg or lower is recommended in such patients. If possible, diuretic therapy should be discontinued for 2-3 days prior to initiation of therapy with Enalapril 5mg Tablets. Renal function and serum potassium should be monitored.
The usual maintenance dose is 20 mg daily. The maximum maintenance dose is 40 mg daily.
Heart Failure/Asymptomatic Left Ventricular Dysfunction
In the management of symptomatic heart failure, Enalapril 5mg Tablets are used in addition to diuretics and, where appropriate, digitalis or beta-blockers. The initial dose of Enalapril 5mg Tablets in patients with symptomatic heart failure or asymptomatic left ventricular dysfunction is 2.5 mg, and it should be administered under close medical supervision to determine the initial effect on the blood pressure. In the absence of, or after effective management of, symptomatic hypotension following initiation of therapy with Enalapril 5mg Tablets in heart failure, the dose should be increased gradually to the usual maintenance dose of 20 mg, given in a single dose or two divided doses, as tolerated by the patient. This dose titration is recommended to be performed over a 2 to 4 week period. The maximum dose is 40 mg daily given in two divided doses.
Suggested Dosage Titration of Enalapril 5mg Tablets in Patients with Heart Failure/Asymptomatic Left Ventricular Dysfunction
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*Special precautions should be followed in patients with impaired renal function or taking diuretics (See 4.4 'Special warnings and precautions for use').
Blood pressure and renal function should be monitored closely both before and after starting treatment with Enalapril 5mg Tablets (see 4.4 'Special warnings and precautions for use') because hypotension and (more rarely) consequent renal failure have been reported. In patients treated with diuretics, the dose should be reduced if possible before beginning treatment with Enalapril 5mg Tablets. The appearance of hypotension after the initial dose of Enalapril 5mg Tablets does not imply that hypotension will recur during chronic therapy with Enalapril 5mg Tablets and does not preclude continued use of the drug. Serum potassium and renal function also should be monitored.
Dosage in Renal Insufficiency
Generally, the intervals between the administration of enalapril should be prolonged and/or the dosage reduced.
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*See 4.4 'Special warnings and precautions for use' - Haemodialysis Patients. Enalaprilat is dialysable. Dosage on nondialysis days should be adjusted depending on the blood pressure response.
Use in Elderly
The dose should be in line with the renal function of the elderly patient (see 4.4 'Special warnings and precautions for use', Renal Function Impairment).
Use in paediatrics
There is limited clinical trial experience of the use of Enalapril 5mg Tablets in hypertensive paediatric patients (see 4.4 'Special warnings and precautions for use', 5.1 'Pharmacodynamic properties' and 5.2 'Pharmacokinetic properties'). For patients who can swallow tablets, the dose should be individualised according to patient profile and blood pressure response. The recommended initial dose is 2.5 mg in patients 20 to <50 kg and 5 mg in patients 50 kg. Enalapril 5mg Tablets are given once daily. The dosage should be adjusted according to the needs of the patient to a maximum of 20 mg daily in patients 20 to <50 kg and 40 mg in patients
Enalapril 5mg Tablets are not recommended in neonates and in pediatric patients with glomerular filtration rate <30 ml/min/1.73 m2, as no data are available.
4.3 Contraindications
• Hypersensitivity to enalapril, to any of the excipients or any other ACE inhibitor
• History of angioedema associated with previous ACE-inhibitor therapy
• Hereditary or idiopathic angioedema
• Second and third trimesters of pregnancy ( see sections 4.4 and 4.6)
4.4 Special Warnings And Precautions For Use
Pretreatment assessment of renal function:
Evaluation of the patient should include assessment of renal function prior to initiation of therapy, and during treatment where appropriate.
Symptomatic hypotension:
Symptomatic hypotension is seen rarely in uncomplicated hypertensive patients. In hypertensive patients receiving Enalapril 5 mg, tablets, hypotension is more likely to occur if the patient has been volume-depleted, e.g. by diuretic therapy, dietary salt restriction, dialysis, diarrhoea or vomiting. In patients with heart failure, with or without associated renal insufficiency, symptomatic hypotension has been observed. This is most likely to occur in those patients with more severe degrees of heart failure, as reflected by the use of high doses of loop diuretics, hyponatraemia or functional renal impairment (see “Posology and method of administration” for management of these patients). In these patients, therapy should be started under medical supervision and the patients should be followed closely whenever the dose of 'enalapril' and/or diuretic is adjusted.
Similar considerations may apply to patients with ischaemic heart or cerebrovascular disease in whom an excessive fall in blood pressure could result in a myocardial infarction or cerebrovascular accident.
If hypotension develops, the patient should be placed in a supine position. Volume repletion with oral fluids or intravenous normal saline may be required. Intravenous atropine may be necessary if there is associated bradycardia. A transient hypotensive response is not a contra-indication to further doses, which can usually be given without difficulty once the blood pressure has increased after volume expansion.
In some patients with heart failure who have normal or low blood pressure, additional lowering of systemic blood pressure may occur with Enalapril 5 mg, tablets. This effect is anticipated, and usually is not a reason to discontinue treatment. If such hypotension becomes symptomatic, a reduction of dose and/or discontinuation of the diuretic and/or Enalapril 5 mg, tablets may become necessary.
Aortic or mitral valve stenosis/hypertrophic cardiomyopathy
As with all vasodilators, ACE inhibitors should be given with caution in patients with left ventricular valvular and outflow tract obstruction and avoided in cases of cardiogenic shock and haemodynamically significant obstruction.
Renal function impairment
In cases of renal impairment (creatinine clearance <80 ml/min) the initial enalapril dosage should be adjusted according to the patient's creatinine clearance ,and then as a function of the patient's response to treatment. Routine monitoring of potassium and creatinine are part of normal medical practice for these patients.
Renal failure has been reported in association with Enalapril 5 mg, tablets and has been occurring mainly in patients with severe heart failure or underlying renal disease, including renal artery stenosis. If recognised promptly and treated appropriately, renal failure when associated with therapy with Enalapril 5 mg, tablets is usually reversible.
Some hypertensive patients, with no apparent pre-existing renal disease, have developed increases in blood urea and creatinine when Enalapril 5 mg, tablets have been given concurrently with a diuretic. Dosage reduction of Enalapril 5 mg, tablets and/or discontinuation of the diuretic may be required. This situation should raise the possibility of an underlying renal artery stenosis
Renovascular hypertension:
There is an increased risk of hypotension and renal insufficiency when patients with bilateral renal artery stenosis or stenosis of the artery to a single functioning kidney are treated with ACE inhibitors. Loss of renal function may occur with only mild changes in serum creatinine. In these patients, therapy should be initiated under close medical supervision with low doses, careful titration, and monitoring of renal function.
Kidney transplantation
There is no experience regarding the administration of 'enalapril' in patients with a recent kidney transplantation. Treatment with 'enalapril' is therefore not recommended.
Hepatic failure
Rarely, ACE inhibitors have been associated with a syndrome that starts with cholestatic jaundice or hepatitis 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.
Neutropenia/Agranulocytosis
Neutropenia/agranulocytosis, thrombocytopenia and anaemia have been reported in patients receiving ACE inhibitors. In patients with normal renal function and no other complicating factors, neutropenia occurs rarely. Enalapril should be used with extreme caution in patients with collagen vascular disease, immunosuppressant therapy, treatment with allopurinol or procainamide, or a combination of these complicating factors, especially if there is pre-existing impaired renal function. Some of these patients developed serious infections which in a few instances did not respond to intensive antibiotic therapy. If enalapril is used in such patients, periodic monitoring of white blood cell counts is advised and patients should be instructed to report any sign of infection.
Hypersensitivity / Angioneurotic oedema:
Angioneurotic oedema of the face, extremities, lips, tongue, glottis and/or larynx has been reported with angiotensin-converting enzyme inhibitors, including Enalapril 5 mg, tablets. This may occur at any time during treatment. In such cases, Enalapril 5 mg, tablets should be discontinued immediately and appropriate monitoring should be instituted to ensure complete resolution of symptoms prior to dismissing the patient.
Even in those instances where swelling of only the tongue is involved, without respiratory distress, patients may require prolonged observation since treatment with antihistamines and corticosteroids may not be sufficient.
Very rarely, fatalities have been reported due to angioedema associated with laryngeal oedema or tongue oedema. Patients with involvement of the tongue, glottis or larynx are likely to experience airway obstruction especially those with a history of airway surgery. Where there is involvement of the tongue, glottis or larynx, likely to cause airway obstruction, appropriate therapy, which may include subcutaneous epinephrine solution 1:1000 (0.3 ml to 0.5 ml) and/or measures to ensure a patent airway, should be administered promptly.
Black patients receiving ACE inhibitors have been reported to have a higher incidence of angioedema compared to non-blacks.
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 “Contra-indications”).
Other hypersensitivity reactions including urticaria have been reported.
Anaphylactic reactions during hymenoptera desensitisation:
Rarely, patients receiving ACE inhibitors during desensitisation with hymenoptera venom (e.g. Bee or Wasp venom) have experienced life- threatening anaphylactoid reactions. These reactions were avoided by temporarily withholding ACE-inhibitor therapy prior to each desensitisation.
Anaphylactoid reactions during LDL apheresis:
Rarely, patients receiving ACE inhibitors during low-density lipoprotein (LDL) apheresis with dextran sulphate have experienced life-threatening anaphylactoid reactions. These reactions were avoided by temporarily withholding ACE-inhibitor therapy prior to each apheresis.
Haemodialysis patients:
Anaphylactoid reactions have been reported in patients dialysed with high-flux membranes (e.g. AN 69) and treated concomitantly with an ACE inhibitor. In these patients, consideration should be given to using a different type of dialysis membrane or a different class of antihypertensive agent.
Hypoglycaemia
Diabetic patients treated with oral antidiabetic agents or insulin starting an ACE inhibitor, should be told to closely monitor for hypoglycemia, especially during the first month of combined use. (See 4.5 'Interaction with other medicinal products and other forms of interaction', Antidiabetics.)
Cough:
Cough has been reported with the use of ACE inhibitors. Characteristically, the cough is non-productive, persistent and resolves after discontinuation of therapy. ACE-inhibitor-induced cough should be considered as part of the differential diagnosis of cough.
Surgery / Anesthesia:
In patients undergoing major surgery or during anesthesia with agents that produce hypotension, Enalapril 5 mg, tablets block angiotensin-II formation secondary to compensatory renin release. This may lead to hypotension which can be corrected by volume expansion.
Hyperkalaemia
Elevations in serum potassium have been observed in some patients treated with ACE inhibitors, including enalapril. Risk factors for the development of hyperkalemia include those with renal insufficiency, worsening of renal function, age (>70 years) diabetes mellitus, inter-current events in particular dehydration, acute decompensation, metabolic acidosis and concomitant use of potassium-sparing diuretics (e.g., spironolactone, eplerenone, triamterene, or amiloride), potassium supplements or potassium-containing salt substitutes; or those patients taking other drugs associated with increases in serum potassium (e.g. heparin). The use of potassium supplements, potassium-sparing diuretics, or potassium-containing salt substitutes particularly in patients with impaired renal function may lead to a significant increase in serum potassium. Hyperkalemia can cause serious, sometimes fatal arrhythmias. If concomitant use of enalapril and any of the above-mentioned agents is deemed appropriate, they should be used with caution and with frequent monitoring of serum potassium. (See 4.5 'Interaction with other medicinal products and other forms of interaction'.)
Lithium
The combination of lithium and enalapril is generally not recommended (see 4.5 'Interaction with other medicinal products and other forms of interaction').
Lactose
'Enalapril' contains lactose and therefore should not be used by patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption. Enalapril 5mg Tablets contains less than 200 mg of lactose per tablet.
Paediatric use
There is limited efficacy and safety experience in hypertensive children>6 years old, but no experience in other indications. Limited pharmacokinetic data are available in children above 2 months of age. (Also see 4.2 'Posology and method of administration', 5.1 'Pharmacodynamic properties', and 5.2 'Pharmacokinetic properties'.) 'Innovace' is not recommended in children in other indications than hypertension.
'Enalapril' is not recommended in neonates and in paediatric patients with glomerular filtration rate <30 ml/min/1.73 m2, as no data are available. (See 4.2 'Posology and method of administration'.)
Pregnancy
ACE inhibitors should not be initiated during pregnancy. Unless continued ACE inhibitor therapy is considered essential, patients planning pregnancy should be changed to alternative antihypertensive treatments which have an established safety profile for use in pregnancy. When pregnancy is diagnosed, treatment with ACE inhibitors should be stopped immediately, and, if appropriate, alternative therapy should be started (see sections 4.3 and 4.6).
Use of enalapril is not recommended during breast-feeding.
Ethnic differences
As with other angiotensin-converting enzyme inhibitors, enalapril is apparently less effective in lowering blood pressure in black people than in non-blacks, possibly because of a higher prevalence of low-renin states in the black hypertensive population.
4.5 Interaction With Other Medicinal Products And Other Forms Of Interaction
Combination with other antihypertensive agents such as beta-blockers, hydralazine, methyldopa, calcium antagonists, and diuretics may increase the antihypertensive efficacy. Adrenergic-blocking drugs should only be combined with Enalapril 5 mg, tablets under careful supervision. Concomitant propranolol may reduce the bioavailability of Enalapril 5 mg, tablets, but this does not appear to be of any clinical significance. Concomitant use with nitroglycerine and other nitrates, or other vasodilators, may further reduce blood pressure.
Potassium-sparing diuretics or potassium supplements
ACE inhibitors attenuate diuretic-induced potassium loss. Potassium-sparing diuretics (e.g. spironolactone, triamterene or amiloride), potassium supplements, or potassium-containing salt substitutes may lead to significant increases in serum potassium. If concomitant use is indicated because of demonstrated hypokalaemia they should be used with caution and with frequent monitoring of serum potassium (see 4.4 'Special warnings and special precautions for use').
Diuretics (thiazide or loop diuretics)
Prior treatment with high dose diuretics may result in volume depletion and a risk of hypotension when initiating therapy with enalapril (see 4.4 'Special warnings and special precautions for use'). The hypotensive effects can be reduced by discontinuation of the diuretic, by increasing volume or salt intake or by initiating therapy with a low dose of enalapril.
Lithium
Reversible increases in serum lithium concentrations and toxicity have been reported during concomitant administration of lithium with ACE inhibitors. Concomitant use of thiazide diuretics may further increase lithium levels and enhance the risk of lithium toxicity with ACE inhibitors. Use of enalapril with lithium is not recommended, but if the combination proves necessary, careful monitoring of serum lithium levels should be performed (see 4.4 'Special warnings and special precautions for use').
Tricyclic antidepressants/Antipsychotics/Anaesthetics/Narcotics
Concomitant use of certain anaesthetic medicinal products, tricyclic antidepressants and antipsychotics with ACE inhibitors may result in further reduction of blood pressure (see 4.4 'Special warnings and special precautions for use').
Non-Steroidal Anti-Inflammatory Drugs (NSAIDs)
Chronic administration of NSAIDs may reduce the antihypertensive effect of an ACE inhibitor.
NSAIDs and ACE inhibitors exert an additive effect on the increase in serum potassium, and may result in a deterioration of renal function. These effects are usually reversible. Rarely, acute renal failure may occur, especially in patients with compromised renal function such as the elderly or dehydrated.
Gold
Nitriod reactions (symptoms includ facial flushing , nausea, vomiting and hypotension) have been reported rarely in patients on therapy with injectable gold(sodium aurothiomalate) and comcomitant ACE inhibitor therapy including enalapril
Sympathomimetics
Sympathomimetics may reduce the antihypertensive effects of ACE inhibitors.
Antidiabetics
Epidemiological studies have suggested that concomitant administration of ACE inhibitors and antidiabetic medicines (insulins, oral hypoglycaemic agents) may cause an increased blood-glucose-lowering effect with risk of hypoglycaemia. This phenomenon appeared to be more likely to occur during the first weeks of combined treatment and in patients with renal impairment.. (See 4.4 'Special warnings and precautions for use; Hypoglycemia and 4.8 Undesirable effects; Metabolism and nutrition disorders').
Narcotic drugs / Antipsychotics:
Postural hypotension may occur with ACE inhibitors.
Allopurinol, cytostatic or immunosuppressive agents, systematic corticosteroids or procainamide:
Concomitant administration with ACE inhibitors may lead to an increased risk for leucopenia.
Alcohol
Alcohol enhances the hypotensive effect of ACE inhibitors.
Acetyl salicylic acid, thrombolytics and β-blockers
Enalapril can be safely administered concomitantly with acetyl salicylic acid (at cardiologic doses), thrombolytics and β
Antacids:
Induce /decreased bioavailability of ACE inhibitors.
Cyclosporin:
Cyclosporin increases the risk of hyperkalaemia with ACE inhibitors.
4.6 Pregnancy And Lactation
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Epidemiological evidence regarding the risk of teratogenicity following exposure to ACE inhibitors during the first trimester of pregnancy has not been conclusive; however a small increase in risk cannot be excluded. Unless continued ACE inhibitor therapy is considered essential, patients planning pregnancy should be changed to alternative antihypertensive treatments which have an established safety profile for use in pregnancy. When pregnancy is diagnosed, treatment with ACE inhibitors should be stopped immediately, and, if appropriate, alternative therapy should be started.
Exposure to ACE inhibitor therapy during the second and third trimesters is known to induce human foetotoxicity (decreased renal function, oligohydramnios, skull ossification retardation) and neonatal toxicity (renal failure, hypotension, hyperkalaemia) (See section 5.3.). Should exposure to ACE inhibitor have occurred from the second trimester of pregnancy, ultrasound check of renal function and skull is recommended. Infants whose mothers have taken ACE inhibitors should be closely observed for hypotension (see sections 4.3 and 4.4).
Lactation: Limited pharmacokinetic data demonstrate very low concentrations in breast milk (see section 5.2). Although these concentrations seem to be clinically irrelevant, the use of Enalapril in breastfeeding is not recommended for preterm infants and for the first few weeks after delivery, because of the hypothetical risk of cardiovascular and renal effects and because there is not enough clinical experience. In the case of an older infant, the use of Enalapril in a breast-feeding mother may be considered if this treatment is necessary for the mother and the child is observed for any adverse effect.
4.7 Effects On Ability To Drive And Use Machines
There are no data to suggest that Enalapril 5 mg, tablets affect the ability to drive and use machines.
4.8 Undesirable Effects
Undesirable effects reported for enalapril include:
[Very common (>1/10); common (>1/100, <1/10); uncommon (>1/1,000, <1/100); rare (>1/10,000, <1/1,000); very rare ( <1/10,000), including isolated reports.]
Blood and the lymphatic system disorders:
Uncommon: anaemia (including aplastic and haemolytic).
Rare: neutropenia, decreases in haemoglobin, decreases in haematocrit, thrombocytopenia, agranulocytosis, bone marrow depression, pancytopenia, lymphadenopathy, autoimmune diseases.
Metabolism and nutrition disorders:
Uncommon: hypoglycaemia (see 4.4 'Special warnings and special precautions for use,' Diabetic patients).
Nervous system and psychiatric disorders
Common: headache, depression
Uncommon: confusion, somnolence, insomnia, nervousness, paresthesia, vertigo
Rare: dream abnormality, sleep disorders
Eye disorders:
Very common: blurred vision.
Cardiac and vascular disorders:
Very common: dizziness
Common: hypotension (including orthostatic hypotension), syncope, chest pain, rhythm disturbances, angina pectoris, tachycardia
Uncommon: orthostatic hypotension, palpitations, myocardial infarction or cerebrovascular accident*, possibly secondary to excessive hypotension in high risk patients (see 4.4 'Special warnings and precautions for use')
Rare: Raynaud's phenomenon
Respiratory disorders:
Very common: cough.
Common: dyspnoea.
Uncommon: rhinorrhoea, sore throat and hoarseness, bronchospasm/asthma.
Rare: pulmonary infiltrates, rhinitis, allergic alveolitis/eosinophilic pneumonia.
Gastro-intestinal disorders:
Very common: nausea.
Common: diarrhoea, abdominal pain, taste alteration.
Uncommon: ileus, pancreatitis, vomiting, dyspepsia, constipation, anorexia, gastric irritations, dry mouth, peptic ulcer.
Rare: stomatitis/aphthous ulcerations, glossitis.
Very rare: intestinal angioedema.
Hepatobiliary disorders:
Rare: hepatic failure, hepatitis – either hepatocellular or cholestatic, hepatitis including necrosis, cholestasis (including jaundice).
Skin and subcutaneous tissue disorders:
Common: rash, hypersensitivity/angioneurotic oedema: angioneurotic oedema of the face, extremities, lips, tongue, glottis and/or larynx has been reported (see 4.4 'Special warnings and special precautions for use').
Uncommon: diaphoresis, pruritus, urticaria, alopecia.
Rare: erythema multiforme, Stevens-Johnson syndrome, exfoliative dermatitis, toxic epidermal necrolysis, pemphigus, erythroderma
A symptom complex has been reported which may include some or all of the following: fever, serositis, vasculitis, myalgia/myositis, arthralgia/arthritis, a positive ANA, elevated ESR, eosinophilia, and leukocytosis. Rash, photosensitivity or other dermatologic manifestations may occur.
Renal and urinary disorders:
Uncommon: renal dysfunction, renal failure, proteinuria.
Rare: oliguria.
Reproductive system and breast disorders:
Uncommon: impotence.
Rare: gynecomastia.
General disorders and administration site conditions:
Very common: asthenia.
Common: fatigue.
Uncommon: muscle cramps, flushing, tinnitus, malaise, fever.
Investigations:
Common: hyperkalaemia, increases in serum creatinine.
Uncommon: increases in blood urea, hyponatraemia.
Rare: elevations of liver enzymes, elevations of serum bilirubin.
4.9 Overdose
Limited data are available for overdosage in humans. The most prominent features of overdosage reported to date are marked hypotension, beginning some six hours after ingestion of tablets, concomitant with blockade of the renin-angiotensin-aldosterone system, and stupor. Serum enalaprilat levels 100 times and 200 times higher than usually seen after therapeutic doses have been reported after ingestion of 300 mg and 440 mg of Enalapril, respectively.
The recommended treatment of overdosage is intravenous infusion of normal saline solution. If hypotension occurs, the patient should be placed in the shock position. If available, treatment with angiotensin II infusion and/or intravenous catecholamines may also be considered. If ingestion is recent, take measures aimed at eliminating enalapril maleate (e.g., emesis, gastric lavage, administration of absorbents, and sodium sulphate). Enalaprilat may be removed from the general circulation by haemodialysis. (See 4.4 'Special warnings and precautions for use', Haemodialysis Patients.) Pacemaker therapy is indicated for therapy-resistant bradycardia. Vital signs, serum electrolytes and creatinine concentrations should be monitored continuously.
5. Pharmacological Properties
5.1 Pharmacodynamic Properties
Pharmacotherapeutic group: Agents acting on the renin-angiotensin system, ACE inhibitors, plain
ATC Code: C09A A02
Enalapril 5 mg, tablets contain the maleate salt of enalapril, a derivative of two amino acids; L-alanine and L-proline. Angiotensin-converting enzyme (ACE) is a peptidyl dipeptidase which catalyses the conversion of angiotensin I into the pressor substance angiotensin II. After absorption, Enalapril 5 mg, tablets are hydrolysed to enalaprilat which inhibits ACE. Inhibition of ACE results in decreased plasma renin activity (due to removal of negative feedback of renin release) and decreased aldosterone secretion.
ACE is identical to kinase II, the use of ACE inhibitors may therefore block the degradation of bradykinin. The possible role of this mechanism in the therapeutic effects of enalapril has not yet been elucidated.
While the mechanism through which Enalapril 5 mg, tablets lower blood pressure is believed to be primarily suppression of the renin-angiotensin- aldosterone system, which plays a major role in the regulation of blood pressure, Enalapril 5 mg, tablets are antihypertensive even in patients with low-renin hypertension.
5.2 Pharmacokinetic Properties
Enalapril 5 mg, tablets are rapidly absorbed, with peak serum concentrations of enalapril occurring within one hour. Based on urinary recovery, the extent of absorption of enalapril from Enalapril 5 mg, tablets is approximately 60%.
Following absorption, Enalapril 5 mg, tablets are rapidly and extensively hydrolysed to enalaprilat. Peak serum concentrations of enalaprilat occur 3 to 4 hours after an oral dose of Enalapril tablets. Excretion of Enalapril 5 mg, tablets is primarily renal. The principal components in urine are enalaprilat, accounting for about 40% of the dose and intact enalapril. In subjects with normal renal function, steady state serum concentrations of enalaprilat were achieved by the fourth day of administration. The effective half-life for accumulation of enalaprilat following multiple doses of Enalapril 5 mg, tablets is 11 hours. Accumulation may occur, however in patients with severely impaired renal function, and the dosage of enalapril should be adjusted accordingly. The absorption of Enalapril 5 mg, tablets is not influenced by the presence of food in the gastro-intestinal tract. The extent of absorption and hydrolysis of enalapril is similar for the various doses in the recommended therapeutic range.
Lactation: After a single 20 mg oral dose in five postpartum women, the average peak enalapril milk level was 1.7 µg/L (range 0.54 to 5.9 µg/L) at 4 to 6 hours after the dose. The average peak enalaprilat level was 1.7 µg/L (range 1.2 to 2.3 µg/L); peaks occurred at various times over the 24-hour period. Using the peak milk level data, the estimated maximum intake of an exclusively breastfed infant would be about 0.16% of the maternal weight- adjusted dosage. A woman who had been taking oral enalapril 10 mg daily for 11 months had peak enalapril milk levels of 2 µg/L 4 hours after a dose and peak enalaprilat levels of 0.75 µg/L about 9 hours after the dose. The total amount of enalapril and enalaprilat measured in milk during the 24 hour period was 1.44 µg/L and 0.63 µg/L of milk respectively. Enalaprilat milk levels were undetectable (<0.2 µg/L) 4 hours after a single dose of enalapril 5 mg in one mother and 10 mg in two mothers; enalapril levels were not determined.
5.3 Preclinical Safety Data
No relevant information.
6. Pharmaceutical Particulars
6.1 List Of Excipients
Enalapril 5mg tablets contain the following inactive ingredients:
Lactose
Maize Starch
Glycerol distearate
6.2 Incompatibilities
None.
6.3 Shelf Life
2 years.
6.4 Special Precautions For Storage
Do not store above 25°C.
Store in the original package.
6.5 Nature And Contents Of Container
Enalapril 5mg tablets are available in aluminium foil blisters containing 28 tablets.
6.6 Special Precautions For Disposal And Other Handling
Not applicable.
7. Marketing Authorisation Holder
Accord Healthcare Limited
Sage house , 319 Pinner Road
North Harrow , Middlesex , HA1 4HF
United Kingdom
8. Marketing Authorisation Number(S)
PL 20075/0279
9. Date Of First Authorisation/Renewal Of The Authorisation
23rd December 2004
10. Date Of Revision Of The Text
03/02/2010
11 DOSIMETRY
IF APPLICABLE
12 INSTRUCTIONS FOR PREPARATION OF RADIOPHARMACEUTICALS
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