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ASPEN CARVEDILOL 6,25mg (Tablets); ASPEN CARVEDILOL 12,5mg
ASPEN CARVEDILOL 6,25mg (Tablets)
ASPEN CARVEDILOL 12,5mg (Tablets)
ASPEN CARVEDILOL 25mg (Tablets)
SCHEDULING STATUS:
S3
PROPRIETARY NAME
(and dosage form):
ASPEN CARVEDILOL 6,25mg (Tablets)
ASPEN CARVEDILOL 12,5mg (Tablets)
ASPEN CARVEDILOL 25mg (Tablets)
COMPOSITION:
Each ASPEN CARVEDILOL 6,25mg tablet contains 6,25mg Carvedilol.
Each ASPEN CARVEDILOL 12,5mg tablet contains 12,5mg Carvedilol.
Each ASPEN CARVEDILOL 25mg tablet contains 25mg Carvedilol.
PHARMACOLOGICAL CLASSIFICATION:
A 7.1.3 Other hypotensives.
PHARMACOLOGICAL ACTION:
Carvedilol is a competitive non-selective beta1 and 2-adrenergic blocking agent with also alpha-adrenergic blocking activity and no intrinsic sympathomimetic activity. Carvedilol reduces peripheral vascular resistance through vasodilation and suppresses the renin-angiotensin-aldosterone system through beta blockade.
Pharmacokinetics:
Carvedilol is absorbed from the gastrointestinal tract and extensively metabolised in the liver, primarily by aromatic ring oxidation and glucuronidation.
Absolute bioavailability is about 25% due to the considerable first-pass metabolism. Peak plasma concentration occurs approximately 1hour after administration. Protein binding, especially to albumin, is more than 98%. The absorption rate of carvedilol is slowed by food, but the bioavailability appears not to be affected. The elimination half-life is 6-10hours and excretion is mainly in the bile, with a small part (about 15%) excreted via the kidneys.
The plasma level of carvedilol is an average of about 50% higher in the elderly, compared with younger patients. The plasma level of carvedilol is 5 times higher in patients suffering from cirrhosis of the liver, than in healthy subjects.
INDICATIONS:
Treatment of mild to moderate essential hypertension. Treatment of mild or moderate stable symptomatic heart failure of ischaemic or cardiomyopathic origin in conjunction with standard therapy. ASPEN CARVEDILOL has been used in patients unable to tolerate an ACE inhibitor and also in patients not receiving digitalis.
CONTRA-INDICATIONS:
Hypersensitivity to ASPEN CARVEDILOL. ASPEN CARVEDILOL is contraindicated in patients suffering from bronchospasm or asthma, or patients with a history of obstructive airway disease, bronchitis and chronic respiratory disease.
ASPEN CARVEDILOL is contra-indicated in the following conditions; 2nd and 3rd degree atrioventricular block, severe bradycardia (<50/minute), New York Heart Association (NYHA) Class IV decompensated heart failure requiring intravenous inotropic support, cardiogenic shock, sick sinus syndrome (including sino-atrial block), hepatic function impairment, metabolic acidosis, peripheral vascular disease and Raynaud’s phenomenon. ASPEN CARVEDILOL should not be prescribed to patients suffering from allergic conditions involving the airways, e.g. allergic rhinitis or glottis oedema. ASPEN CARVEDILOL should not be used during pregnancy and lactation.
WARNINGS:
Patients with phaeochromocytoma should never receive ASPEN CARVEDILOL without receiving concomitant alpha-adrenoceptor blocking therapy.
ASPEN CARVEDILOL should be given to patients with congestive heart failure only after adequate clinical control is achieved, and only then with great caution.
Safety and efficacy in children have not been established.
INTERACTIONS:
Warning: Caution should be exercised when transferring a patient from clonidine. The withdrawal of clonidine may result in the release of large amounts of catecholamines which may give rise to a hypertensive crisis. If ASPEN CARVEDILOL is administered in these circumstances, the unopposed alpha-receptor stimulation may potentiate this effect. If ASPEN CARVEDILOL and clonidine are given concurrently, the clonidine should not be discontinued until several days after the withdrawal of ASPEN CARVEDILOL, as severe rebound hypertension may occur. It can be dangerous to administer ASPEN CARVEDILOL concomitantly with the following medicines: hypoglycaemic agents, phenothiazines and various antiarrhythmic agents. Such drug-drug interactions can have life-threatening consequences.
Special note: Digitalisation of patients receiving long-term beta-blocking therapy may be necessary if congestive cardiac failure is likely to develop. This combination may be considered despite the potentiation of negative chronotropic effect of the two medicines. Careful control of the dosages and of the individual patient’s response (and notably pulse rate), is essential in this situation.
ASPEN CARVEDILOL should be avoided in combination with cardio-depressant calcium channel blockers such as verapamil and diltizem.
The hypotensive effects of carvedilol are antagonised by non-steroidal anti-inflammatory agents (NSAIDS).
ASPEN CARVEDILOL may potentiate antidiabetic agents such as insulin or sulphonylureas. Myocardial depressant agents, including antiarrhythmic agents, e.g. disopyramide, procainamide, lignocaine and phenytoin, may have a negative inotropic effect on the heart and there may be a potentiation of the AV conduction time when used concurrently with ASPEN CARVEDILOL.
Enzyme inhibitors, such as quinidine may affect the metabolism and pharmacokinetics of ASPEN CARVEDILOL.
Reserpine and other medicines that can deplete catecholamines, as well as adrenergic neuron blocking agents, such as guanethidine and bethanidine, may cause hypotension and severe bradycardia.
Beta-adrenoreceptor stimulating agents, such as isoprenaline, diminish the effect of carvedilol. Alpha-adrenoreceptor stimulating agents such as noradrenaline and mixed alpha- and beta-adrenoreceptor stimulating agents, such as adrenaline, may enhance the peripheral vasoconstrictor effects of carvedilol and may reverse the hypotensive effects. Rifampicin may decrease the systemic availability of ASPEN CARVEDILOL.
Digoxin levels should be monitored when carvedilol dosages are changed.
Concurrent therapy with cimetidine may result in a 30% increase in the systemic bioavailability of ASPEN CARVEDILOL, but has no effect on the Cmax.
Hydralazine and alcohol may increase the plasma concentration of carvedilol by delaying the hepatic metabolism of ASPEN CARVEDILOL.
PREGNANCY AND LACTATION:
ASPEN CARVEDILOL should not be used during pregnancy and lactation (see "CONTRA-INDICATIONS”). Administration to pregnant mothers shortly before giving birth, or during labour, may result in the newborn infant being born hypotonic, collapsed and hypoglycaemic.
DOSAGE AND DIRECTIONS FOR USE:
Essential hypertension:
ADULTS:
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Initial dose: |
6,25mg twice daily, for 1 to 2 weeks. |
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Maintenancedose: |
12,5mg twice daily. |
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or |
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Initial dose: |
12,5mg once daily, for two days. |
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Maintenance dose: |
25mg once daily. |
At doses higher than 25mg the incidence of side-effects increases significantly with only a marginal increase in efficacy.
ELDERLY:
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Usual dose: |
12,5mg once daily. |
If necessary the dosage may be increased as tolerated, at intervals of at least 2weeks, to 25mg once daily or in divided doses.
Heart failure (in conjunction with standard therapy):
To reduce the incidence of orthostatic effects ASPEN CARVEDILOL should be taken with food to slow the rate of absorption. The bioavailability of ASPEN CARVEDILOL is not affected by food. It is advised that the dosage be individualised and that the patient be closely monitored by a medical practitioner experienced in the management of heart failure, during up-titration. Patients receiving digitalis, diuretics and/or angiotensin-converting enzyme (ACE) inhibitors, should be stabilised prior to carvedilol therapy.
ADULTS:
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Initial dose: |
3,125mg twice daily for two weeks. |
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Increase to: |
6,25mg twice daily for two weeks. |
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Maintenance dose: |
25mg twice daily for patients weighing <85kg (maximum dose). |
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Increase to: |
50mg twice daily for patients weighing >85kg (maximum dose). |
An interval of at least two weeks should be allowed after each dose increase. Before the dosage is increased, the patient should be eva luated for symptoms of worsening heart failure or vasodilation. Transient heart failure and fluid retention should be treated with increased doses of a diuretic. It may be necessary to lower the ASPEN CARVEDILOL dosage or to discontinue carvedilol therapy temporarily in some cases. Should treatment be discontinued for two weeks or more, it is advised that therapy be reinstated at 3,125mg twice daily for two weeks and the dosage then increased in line with the abovementioned dosage instructions.
Symptoms of vasodilation (headache, dizziness, postural hypotension) may initially be managed by a dose reduction of the diuretic.
Should the symptoms persist, the dose of ACE inhibitor may be reduced, followed by a reduction in the dose of ASPEN CARVEDILOL, if necessary. All symptoms of vasodilation or worsening heart failure must be stabilised before the dose of carvedilol is increased in line with the recommended dose instructions.
SIDE EFFECTS AND SPECIAL PRECAUTIONS:
Side effects:
Blood and lymphatic system disorders:
Less frequent: thrombocytopenia, agranulocytosis.
The following side effects have been reported and frequencies are unknown: non-thrombocytopenia purpura, transient eosinophilia.
Endocrine disorders:
The following side effects have been reported and frequencies are unknown: hypoglycaemia, hyperglycaemia.
Psychiatric disorders:
Less frequent: depression.
The following side effects have been reported and frequencies are unknown: overt psychosis.
Nervous system disorders:
More frequent: fatigue, dizziness, paraesthesia.
Less frequent: headache, sleeplessness.
The following side effects have been reported and frequencies are unknown: malaise, vivid dreams and nightmares, hallucinations, confusion and peripheral neuropathy.
Eye disorders:
Less frequent: decreased tear production, blurred vision.
The following side effects have been reported and frequencies are unknown: ocular pain.
Cardiovascular disorders:
More frequent: marked bradycardia and hypotension, chest pain, generalised oedema and syncope. Heart block may be precipitated in patients with underlying cardiac disorders.
The following side effects have been reported and frequencies are unknown: exacerbation of peripheral vascular disease or the development of Raynaud’s phenomenon (due to unopposed arteriolar alpha-sympathetic activation) may occur. Severe peripheral vascular disease and even peripheral gangrene may be precipitated. Congestive cardiac failure.
Respiratory, thoracic and mediastinal disorders:
More frequent: dyspnoea.
Less frequent: pharyngitis, rhinitis.
The following side effects have been reported and frequencies are unknown: bronchoconstriction may occur in patients suffering from asthma, bronchitis and other chronic pulmonary diseases. Pneumonitis, pulmonary fibrosis and pleurisy.
Gastrointestinal disorders:
More frequent: diarrhoea.
Less frequent: abdominal cramping, vomiting, nausea.
The following side effects have been reported and frequencies are unknown: constipation.
Hepatobiliary disorders:
Less frequent: hepatic injury.
Skin and subcutaneous tissue disorders:
Less frequent: increased sweating.
The following side effects have been reported and frequencies are unknown: allergic skin reactions and reversible alopecia. Exacerbation of psoriasis.
Musculoskeletal and connective tissue disorders:
More frequent: back pain.
Less frequent: myopathies, including muscle cramps. Arthralgia.
The following side effects have been reported and frequencies are unknown: skeletal muscle weakness.
Renal and urinary disorders:
Less frequent: haematuria.
The following side effects have been reported and frequencies are unknown: renal function may deteriorate in patients suffering from congestive cardiac failure.
Reproductive system and breast disorders:
The following side effects have been reported and frequencies are unknown: impotence.
General disorders:
Less frequent: fever.
Special Precautions:
ASPEN CARVEDILOL should be given to patients with congestive heart failure only after adequate clinical control is achieved, and only then with great caution, especially if the heart failure is controlled with digitalis, diuretics and/or ACE inhibitors.
Before the dosage is increased, the patient should be eva luated for symptoms of worsening heart failure or vasodilation. Transient heart failure and fluid retention should be treated with increased doses of a diuretic. It may be necessary to lower the ASPEN CARVEDILOL dosage or to discontinue ASPEN CARVEDILOL therapy temporarily in some cases. All symptoms of vasodilation or worsening heart failure must be stabilised before the dose of ASPEN CARVEDILOL is increased in line with the recommended dosage instructions.
It is of the greatest importance that the anaesthetist be informed that a beta-blocker is being taken by the patient, prior to anaesthesia. ASPEN CARVEDILOL therapy should be discontinued 48hours prior to anaesthesia. If this is not possible, an agent such as atropine may be administered to counter increases in vagal tone.
In the perioperative period it is generally unwise to reduce the dosage to which the patient is accustomed, as there may be danger of aggravation of angina pectoris or of hypertension. A patient’s normal tachycardiac response to hypovolaemia or blood loss may be obscured during and after surgery. Particular caution should be taken in this regard.
Safety during long-term administration has not been demonstrated.
Adverse reactions are more common in patients with renal decompensation, and in patients who receive the medicine intravenously.
A dose reduction is necessary in elderly patients, or in patients suffering from renal dysfunction.
Abrupt discontinuation of therapy may cause exacerbation of angina pectoris in patients suffering from ischaemic heart disease. Discontinuation of therapy should be gradual (over a period of 1 to 2weeks) and patients should be advised to limit the extent of their physical activity during the period that the medicine is being discontinued.
Patients with phaeochromocytoma should receive concomitant alpha-adrenoceptor blocking therapy.
There is no clinical experience in the use of ASPEN CARVEDILOL in patients suffering from Prinzmetal’s variant angina. Caution is advised as ASPEN CARVEDILOL may provoke chest pain in patients suspected of suffering from this disease.
ASPEN CARVEDILOL may cause bradycardia. A dose reduction is advised should the pulse rate drop to <55beats/minute.
Early signs of acute hypoglycaemia may be masked by the administration of ASPEN CARVEDILOL. Caution is advised when ASPEN CARVEDILOL is prescribed to diabetic patients. A dose reduction of antidiabetic medication or insulin may be necessary.
The symptoms of hyperthyroidism may be masked by ASPEN CARVEDILOL.
When dizziness or related symptoms are experienced, the patient should be advised not to drive or operate machinery.
Wearers of contact lenses should be informed that there may be a reduction in lacrimation. Psoriasis may be aggravated. Patients with a history of anaphylaxis to an antigen may be more reactive to repeated challenge with the antigen while taking ASPEN CARVEDILOL.
KNOWN SYMPTOMS OF OVERDOSAGE AND PARTICULARS OF ITS TREATMENT:
Overdosage may produce bradycardia and severe hypotension. Bronchospasm and cardiac failure may occur in some patients.
Bradycardia and severe hypotension should be treated with intravenous atropine. Incremental doses of up to 3mg should be given immediately. If necessary, this should be followed by a slow intravenous infusion of isoprenaline. If further measures are required, noradrenaline may be preferable in restoring circulation. The recommended starting dose for noradrenaline is 5-10micrograms given intravenously, and should be repeated according to the patient’s response. Alternatively, it may be given by intravenous infusion at a rate of 5micrograms/minute until a response is achieved.
In case of therapy-resistant bradycardia, pacemaker therapy should be performed. In severe overdosage the following regime may be preferred:
Initially 1-10mg glucagon intravenously, followed by intravenous infusion at a rate of 2-2,5mg/hour.
Bronchospasm should be treated with intravenous aminophylline, and cardiac failure with glucagons and/or pacing.
Peripheral vasodilation may be treated with noradrenaline with continuous monitoring of the circulation.
In the event of seizures, diazepam or clonazepam may be given as slow intravenous injection.
Since a prolonged elimination half-life of ASPEN CARVEDILOL can be expected, treatment with antidotes must be continued for a sufficiently long period of time when there are symptoms of shock, following severe intoxication with ASPEN CARVEDILOL.
IDENTIFICATION:
ASPEN CARVEDILOL 6,25mg: white, film coated, oval shaped tablet, imprinted “P”logo one side and 6,25 on the other side
ASPEN CARVEDILOL 12,5mg: white, film coated, oval shaped tablet, imprinted “P”logo one side and 12,5 on the other side
ASPEN CARVEDILOL 25mg: white, film coated, oval shaped tablet, imprinted “P”logo one side and 25 on the other side
PRESENTATION:
ASPEN CARVEDILOL 6,25mg, ASPEN CARVEDILOL 12,5mg and ASPEN CARVEDILOL 25mg: 100 tablets in round, white HDPE bottle with polypropylene cap. 28 or 30 tablets in opaque PVC/Aluminium blister strips of 7’s or 10’s in a carton.
STORAGE INSTRUCTIONS:
Store below 25ºC. KEEP OUT OF THE REACH OF CHILDREN.
REGISTRATION NUMBERS:
ASPEN CARVEDILOL 6,25mg: 41/7.1.3/0002 –ASPEN CARVEDILOL 12,5mg: 41/7.1.3/0003 –ASPEN CARVEDILOL 25mg: 41/7.1.3/0001
NAME AND BUSINESS ADDRESS OF THE HOLDER OF THE CERTIFICATE OF REGISTRATION:
PHARMACARE LIMITED –Healthcare Park, Woodlands Drive, Woodmead, Sandton, 2148
DATE OF PUBLICATION OF THIS PACKAGE INSERT:
22 January 2007
308665 070719 Harry’s Printers-K37094 I07
New addition to this site: May 2008
Source: Pharmaceutical Industry
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