Quinaretic

For the treatment of all grades of essential hypertension in patients who have been stabilised on the individual components given in the same proportions.

Posology

Adults

For patients currently not receiving a diuretic, whether or not they have been receiving quinapril monotherapy, the recommended initial dosage of quinapril/HCTZ is 10/12.5 mg. Following initial therapy, the dosage may be increased to 20/25 mg. Effective blood pressure control is usually achieved with a dosage of 10/12.5 mg.

Take either with or without food. The dose should always be taken at about the same time of day to help increase compliance.

In patients with congestive heart failure, with or without associated renal insufficiency, ACE inhibitor therapy for hypertension may cause an excessive drop in blood pressure. Accuretic therapy should be started under close medical supervision. Patients should be followed closely for the first two weeks of treatment and whenever the dosage is increased.

Renal Impairment

Accuretic is not recommended for use in patients with creatinine clearance of less than 40 mL/min.

Elderly

The dose should be kept as low as possible commensurate with achievement of adequate blood pressure control.

Paediatric Population

2 but no recommendation on a posology can be made.

Method of administration

For oral use.

The tablets should not be chewed, crushed or divided.

Accuretic is contraindicated:

- In second and third trimesters of pregnancy.

- -derived drugs including patients with a history of angioedema related to previous treatment with angiotensin-converting enzyme (ACE) inhibitors.

- In patients with anuria or with severe renal dysfunction.

- In patients with dynamic left ventricular outflow obstruction.

- In patients with hereditary/idiopathic angioneurotic oedema.

- With administration of aliskiren-containing products in patients with diabetes mellitus or in patients with renal impairment (glomerular filtration rate [GFR] < 60 mL/min/1.73 m²).

- In combination with sacubitril/valsartan due to the increased risk of angioedema.

Aortic Stenosis

Accuretic should be used with caution in selected patients with aortic stenosis.

Hypotension

Accuretic can cause symptomatic hypotension, usually not more frequently than either drug as monotherapy. Symptomatic hypotension is rarely seen in uncomplicated hypertensive patients treated with quinapril. In hypertensive patients receiving quinapril, 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, or has severe renin-dependent hypertension.

Accuretic should be used cautiously in patients receiving concomitant therapy with other antihypertensive agents. The thiazide component of Accuretic may potentiate the action of other antihypertensive drugs, especially ganglionic or peripheral adrenergic-blocking drugs. The antihypertensive effects of the thiazide component may also be enhanced in postsympathectomized patients.

If symptomatic 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; however, lower doses of quinapril or of any concomitant diuretic therapy should be considered if this event occurs.

In patients with congestive heart failure, with or without associated renal insufficiency, ACE inhibitor therapy for hypertension may cause an excessive drop in blood pressure, which may be associated with oliguria, azotaemia, and in rare instances, with acute renal failure and death in such patients. Accuretic therapy should be started under close medical supervision. Patients should be followed closely for the first two weeks of treatment and whenever the dosage is increased.

Sensitivity reactions

Sensitivity reactions may occur in patients with or without a history of allergy or bronchial asthma, e.g. purpura, photosensitivity, urticaria, necrotising angiitis, respiratory distress including pneumonitis and pulmonary oedema, anaphylactic reactions.

Heart Failure/Heart Disease

As a consequence of inhibiting the renin-angiotensin-aldosterone system, changes in renal function may be anticipated in susceptible individuals. In patients with severe heart failure, whose renal function may depend on the activity of the renin- angiotensin-aldosterone system, treatment with ACE inhibitors including quinapril, may be associated with oliguria and/or progressive azotaemia and rarely acute renal failure and/or death.

Cough

Cough has been reported with the use of ACE inhibitors including quinapril. 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.

Renal Disease

Accuretic should be used with caution in patients with renal disease. In severe renal disease thiazides may precipitate azotaemia and in moderate renal impairment (creatinine clearance 10-20 mL/min) thiazides are generally ineffective in such patients, and the effects of repeated dosing may be cumulative.

There is insufficient experience in patients with severe renal impairment (creatinine clearance <10 mL/min). Before ACE inhibitor treatment, renal artery stenosis should be excluded in renal transplant patients.

The half-life of quinaprilat (the main active metabolite of quinapril) is prolonged as creatinine clearance falls. Patients with a creatinine clearance of <60 mL/min require a lower initial dosage of quinapril. These patients' dosage should be titrated upwards based upon therapeutic response, and renal function should be closely monitored although initial studies do not indicate that quinapril produces further deterioration in renal function.

In clinical studies in hypertensive patients with unilateral or bilateral renal artery stenosis, increases in blood urea nitrogen and serum creatinine have been observed in some patients following ACE inhibitor therapy. These increases were almost always reversible upon discontinuation of the ACE inhibitor and/or diuretic therapy. In such patients, renal function should be monitored during the first few weeks of therapy.

Some patients with hypertension or heart failure with no apparent pre-existing renal disease have developed increases (>1.25 times the upper limit of normal) in blood urea nitrogen and serum creatinine, usually minor and transient, especially when quinapril has been given concomitantly with a diuretic. Increases in blood urea nitrogen and serum creatinine have been observed in 2% and 2%, respectively of hypertensive patients on quinapril monotherapy and in 4% and 3%, respectively of hypertensive patients on quinapril/HCTZ. These increases are more likely to occur in patients with pre-existing renal impairment. Dosage reduction and/or discontinuation of a diuretic and/or quinapril may be required.

Dual Blockade of the Renin-Angiotensin-Aldosterone System (RAAS)

There is evidence that the concomitant use of ACE inhibitors, angiotensin II receptor blockers or aliskiren increases the risk of hypotension, hyperkalaemia and decreased renal function (including acute renal failure). Dual blockade of RAAS through the combined use of ACE inhibitors, angiotensin II receptor blockers or aliskiren is therefore not recommended.

If dual blockade therapy is considered absolutely necessary, this should only occur under specialist supervision and subject to frequent close monitoring of renal function, electrolytes and blood pressure.

ACE inhibitors and angiotensin II receptor blockers should not be used concomitantly in patients with diabetic nephropathy.

Impaired Hepatic Function

Accuretic should be used with caution in patients with impaired hepatic function or progressive liver disease since minor alterations of fluid and electrolyte balance may result from thiazide treatment and may precipitate hepatic coma. Quinapril is rapidly deesterified to quinaprilat, (quinapril diacid, the principal metabolite), which, in human and animal studies, is a potent ACE inhibitor. The metabolism of quinapril is normally dependent upon hepatic esterase. Quinaprilat concentrations are reduced in patients with alcoholic cirrhosis due to impaired deesterification of quinapril.

Rarely, ACE inhibitors have been associated with a syndrome beginning as a cholestatic jaundice and progressing to a fulminant hepatic necrosis (in some cases fatal). Patients who during ACE inhibitor therapy experience jaundice or clearly elevated hepatic enzymes should discontinue quinapril/HCTZ and receive appropriate medical follow-up.

Immune-Mediated Drug Reactions/Anaphylactoid Reactions

Desensitisation: Patients receiving ACE inhibitors during desensitising treatment with hymenoptera venom have sustained life-threatening anaphylactoid reactions. In the same patients, these reactions have been avoided when ACE inhibitors were temporarily withheld, but they have reappeared upon inadvertent rechallenge.

Stevens-Johnson syndrome and exacerbations or activation of systemic lupus erythematosus have been reported with thiazides.

Angioedema

Angioedema has been reported in patients treated with ACE inhibitors. If laryngeal stridor or angioedema of the face, tongue or glottis occurs, treatment with Accuretic should be discontinued immediately; the patient should be treated in accordance with accepted medical care and carefully observed until the swelling disappears. In instances where the swelling is confined to the face and lips, the condition generally resolves without treatment; antihistamines may be useful in relieving symptoms. Angioedema associated with laryngeal involvement may be fatal. Where there is involvement of the tongue, glottis or larynx likely to cause airway obstruction, appropriate emergency therapy including e.g. subcutaneous adrenaline solution 1:1000 (0.3 - 0.5 mL) should be promptly administered.

The combination of quinapril with sacubitril/valsartan is contraindicated due to the increased risk of angioedema. Sacubitril/valsartan must not be initiated until 36 hours after taking the last dose of quinapril therapy. If treatment with sacubitril/valsartan is stopped, quinapril therapy must not be initiated until 36 hours after the last dose of sacubitril/valsartan. Concomitant use of other neutral endopeptidase (NEP) inhibitors (e.g. racecadotril) and ACE inhibitors may also increase the risk of angioedema. Hence, a careful benefit-risk assessment is needed before initiating treatment with NEP inhibitors (e.g. racecadotril) in patients on quinapril.

Patients taking concomitant mTOR inhibitor (e.g. temsirolimus) or concomitant DPP-IV inhibitor (e.g. vildagliptin) therapy may be at increased risk for angioedema. Caution should be used when starting an mTOR inhibitor or a DPP-IV inhibitor in a patient already taking an ACE inhibitor.

Patients with a history of angioedema unrelated to ACE inhibitor therapy may be at increased risk of angioedema while receiving an ACE inhibitor.

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.

Ethnic Differences

Black patients receiving ACE inhibitor therapy have been reported to have a higher incidence of angioedema compared to non-black patients. It should also be noted that in controlled clinical trials, ACE inhibitors have an effect on blood pressure that is less in black patients than in non-black patients.

Haemodialysis and Low-Density Lipoprotein Apheresis

Patients haemodialysed using high-flux polyacrylonitrile ('AN69') membranes are highly likely to experience anaphylactoid reactions if they are treated with ACE inhibitors. This combination should therefore be avoided, either by use of alternative antihypertensive drugs or alternative membranes for haemodialysis. Patients undergoing low-density lipoprotein (LDL) apheresis with dextran-sulfate absorption when treated concomitantly with an ACE inhibitor, have reported anaphylactoid reactions. This method should therefore not be used in patients treated with ACE inhibitors.

Derangements of Serum Electrolytes

Patients receiving Accuretic should be observed for clinical signs of thiazide induced fluid or electrolyte imbalance. In such patients periodic determination of serum electrolytes (sodium and potassium in particular) should be performed. Because quinapril reduces the production of aldosterone, its combination with HCTZ may minimise diuretic induced hypokalaemia.

The opposite effects of quinapril and HCTZ on serum potassium will approximately balance each other in many patients so that no net effect upon serum potassium will be seen. In other patients, one or the other effect may be dominant and some patients may still require potassium supplements. Initial and periodic determinations of serum electrolytes to detect possible electrolyte imbalance should be performed at appropriate intervals.

Calcium excretion is decreased by thiazides. In a few patients on prolonged thiazide therapy, pathological changes in the parathyroid gland have been observed, with hypercalcemia and hypophosphatemia. More serious complications of hyperparathyroidism (renal lithiasis, bone resorption, and peptic ulceration) have not been seen.

Thiazides should be discontinued before performing tests for parathyroid function.

Thiazides increase the urinary excretion of magnesium, and hypomagnesemia may result.

Other Metabolic Disturbances

Thiazide diuretics tend to reduce glucose tolerance and raise serum levels of cholesterol, triglycerides, and uric acid. These effects are usually minor, but frank gout or overt diabetes may be precipitated in susceptible patients.

Hypokalaemia

Conversely, treatment with thiazide diuretics has been associated with hypokalaemia, hyponatremia, and hypochloremic alkalosis. These disturbances have sometimes been manifest as one or more of the following: dryness of mouth, thirst, weakness, lethargy, drowsiness, restlessness, muscle pains or cramps, muscular fatigue, hypotension, oliguria, tachycardia, nausea, confusion, seizures and vomiting. Hypokalaemia can also sensitize or exaggerate the response of the heart to the toxic effects of digitalis. The risk of hypokalaemia is greatest in patients with cirrhosis of the liver, in patients experiencing a brisk diuresis, in patients who are receiving inadequate oral intake of electrolytes, and in patients receiving concomitant therapy with corticosteroids or adrenocorticotrophic hormone (ACTH) or with other drugs known to increase the risk of hypokalaemia induced by thiazide diuretics.

Hyperkalaemia

Concomitant medications that could raise serum potassium levels should be carefully considered. Patients should be told not to use potassium supplements or salt substitutes containing potassium without consulting their physician.

Diabetes

Thiazide-induced hyperglycaemia may compromise blood sugar control. Depletion of serum potassium augments glucose intolerance. Monitor glycaemic control, supplement potassium, if necessary, to maintain appropriate serum potassium levels, and adjust diabetes medications as required.

In diabetic patients ACE inhibitors may enhance insulin sensitivity and have been associated with hypoglycaemia in patients treated with oral antidiabetic agents or insulin. Glycaemic control should be closely monitored particularly during the first month of treatment with an ACE inhibitor.

Neutropenia/Agranulocytosis

ACE inhibitors have been rarely associated with agranulocytosis and bone marrow depression in patients with uncomplicated hypertension, but more frequently in patients with renal impairment, especially if they also have a connective disease with the concomitant use of immunosuppressive or other agents which may be associated with neutropenia/agranulocytosis. Patients should be told to report promptly any indication of infection (e.g., sore throat, fever) as this could be a sign of neutropenia.

Agranulocytosis has been rarely reported during treatment with quinapril. As with other ACE inhibitors, periodic monitoring of the white blood cell counts in quinapril-treated patients with collagen vascular disease and/or renal disease should be considered.

Surgery/Anaesthesia

In patients undergoing major surgery or during anaesthesia with agents that produce hypotension, quinapril may block angiotensin II formation secondary to compensatory renin release. If hypotension occurs and is considered to be due to this mechanism, it can be corrected by volume expansion.

Acute Myopia and Secondary Angle-Closure Glaucoma

HCTZ, a sulfonamide, can cause an idiosyncratic reaction, resulting in acute transient myopia and acute angle-closure glaucoma. Symptoms include acute onset of decreased visual acuity or ocular pain and typically occur within hours to weeks of drug initiation. Untreated acute angle-closure glaucoma can lead to permanent vision loss. The primary treatment is to discontinue HCTZ as rapidly as possible. Prompt medical or surgical treatments may need to be considered if the intraocular pressure remains uncontrolled. Risk factors for developing acute angle-closure glaucoma may include a history of sulfonamide or penicillin allergy.

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.

Lactose

Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose/galactose malabsorption should not use this medicine.

Lithium

Lithium generally should not be given with diuretics. Diuretic agents reduce the renal clearance of lithium and add a high risk of lithium toxicity.

The ability to engage in activities such as operating machinery or operating a motor vehicle may be impaired due to dizziness and fatigue, especially when initiating quinapril therapy.

The following undesirable effects have been observed and reported during treatment with quinapril/HCTZ with the following frequencies: very common (>1/10); common (>1/100 to <1/10); uncommon (>1/1,000 to ≤1/100); rare (>1/10,000 to ≤1/1,000); very rare (≤1/10,000), not known (cannot be estimated from the available data).

* Such increases are more likely to occur in patients receiving concomitant diuretic therapy than those on monotherapy with quinapril. These observed increases will often reverse on continued therapy.

^# Adverse reactions associated with quinapril component, frequencies observed when taking quinapril/HCTZ.

^## Adverse reactions associated with quinapril component, frequencies observed in quinapril, adverse reactions not associated with quinapril/HCTZ component.

^∞ In patients with a congenital G-6-PDH deficiency, individual cases of haemolytic anaemia^# have been reported.

Clinical Laboratory Test Findings:

Serum electrolytes

Serum uric acid

Glucose

Changes in magnesium, PBI (protein bound iodine), parathyroid function tests and calcium

Haematology test

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.

No data are available for Accuretic with respect to overdosage in humans.

The most likely clinical manifestation would be symptoms attributable to quinapril monotherapy overdosage such as severe hypotension, which would usually be treated by infusion of intravenous normal saline.

The most common signs and symptoms observed for HCTZ monotherapy overdosage are those caused by electrolyte depletion (hypokalaemia, hypochloraemia, hyponatremia) and dehydration resulting from excessive diuresis. If digitalis has also been administered, hypokalaemia may accentuate cardiac arrhythmias.

No specific information is available on the treatment of overdosage with quinapril/HCTZ.

Haemodialysis and peritoneal dialysis have little effect on the elimination of quinapril and quinaprilat. Treatment is symptomatic and supportive consistent with established medical care.

Pharmacotherapeutic group: quinapril and diuretics, ATC code: C09BA06.

Quinapril is rapidly de-esterified to quinaprilat (quinapril diacid, the principal metabolite), which is a potent angiotensin-converting enzyme (ACE) inhibitor.

Quinapril and HCTZ lower blood pressure by different, though complementary mechanisms. With diuretic treatment, blood pressure and blood volume fall, resulting in a rise in angiotensin II levels which tend to blunt the hypotensive effect. Quinapril blocks this rise in angiotensin II. The antihypertensive effects of quinapril and HCTZ are additive.

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 non-black patients, although this difference is reported to disappear when a diuretic is added.

Two large randomised, controlled trials (ONTARGET (On-going Telmisartan Alone and in combination with Ramipril Global Endpoint Trial) and VA NEPHRON-D (The Veterans Affairs Nephropathy in Diabetes)) have examined the use of the combination of an ACE inhibitor with an angiotensin II receptor blocker.

ONTARGET was a study conducted in patients with a history of cardiovascular or cerebrovascular disease, or type 2 diabetes mellitus accompanied by evidence of end-organ damage. VA NEPHRON-D was a study in patients with type 2 diabetes mellitus and diabetic nephropathy.

These studies have shown no significant beneficial effect on renal and/or cardiovascular outcomes and mortality, while an increased risk of hyperkalaemia, acute kidney injury and/or hypotension as compared to monotherapy was observed. Given their similar pharmacodynamic properties, these results are also relevant for other ACE inhibitors and angiotensin II receptor blockers.

ACE inhibitors and angiotensin II receptor blockers should therefore not be used concomitantly in patients with diabetic nephropathy.

ALTITUDE (Aliskiren Trial in Type 2 Diabetes Using Cardiovascular and Renal Disease Endpoints) was a study designed to test the benefit of adding aliskiren to a standard therapy of an ACE inhibitor or an angiotensin II receptor blocker in patients with type 2 diabetes mellitus and chronic kidney disease, cardiovascular disease, or both. The study was terminated early because of an increased risk of adverse outcomes. Cardiovascular death and stroke were both numerically more frequent in the aliskiren group than in the placebo group and adverse events and serious adverse events of interest (hyperkalaemia, hypotension and renal dysfunction) were more frequently reported in the aliskiren group than in the placebo group.

Quinapril

Peak plasma quinapril concentrations are observed within 1 hour of oral administration. The extent of absorption is approximately 60%, and is not influenced by food. Following absorption, quinapril is deesterified to its major active metabolite, quinaprilat, and to minor inactive metabolites. Quinapril has an apparent half-life of approximately 1 hour. Peak plasma quinaprilat concentrations are observed approximately 2 hours following an oral dose of quinapril. Quinaprilat is eliminated primarily by renal excretion and has an effective accumulation half-life of 7 hours. In patients with renal insufficiency and creatinine clearance of ≤40 mL/min, peak and trough quinaprilat concentrations increase, time to peak concentration increases, apparent half-life increases, and time to steady state may be delayed. The elimination of quinaprilat is also reduced in elderly patients (>65 years) and correlates well with the impaired renal function which frequently occurs in the elderly. Studies in rats indicate that Accuretic and its metabolites do not cross the blood-brain barrier.

Hydrochlorothiazide

After oral administration of HCTZ, diuresis begins within 2 hours, peaks in about 4 hours, and lasts about 6 to 12 hours. HCTZ is excreted unchanged by the kidney. When plasma levels have been followed for at least 24 hours, the plasma half-life has been observed to vary between 4 to 15 hours. At least 61% of the oral dose is eliminated unchanged within 24 hours. HCTZ crosses the placenta but not the blood-brain barrier.

Lactation

After a single oral dose of 20 mg of quinapril in six breast-feeding women, the M/P (milk to plasma ratio) for quinapril was 0.12. Quinapril was not detected in milk after 4 hours after the dose. Quinalaprilat milk levels were undetectable (<5 μg/L) at all time points. It is estimated that a breastfed infant would receive about 1.6% of the maternal weight-adjusted dosage of quinapril.

The results of the preclinical tests do not add anything of further significance to the prescriber.

Not applicable.

No special requirements for disposal.

Any unused medicinal product or waste material should be disposed of in accordance with local requirements.