Source: Health Products Regulatory Authority (ZA) Revision Year: 2024 Publisher: Unichem SA (Pty) Ltd, San Domenico, Ground Floor, Unit G4, 10 Church Street, Durbanville, 7551 Cape Town, Tel: +27 21 531 0436
f a woman is contemplating pregnancy or should a woman become pregnant while receiving RENICARD 50, the treatment must be stopped promptly and switched to a different class of antihypertensive medicine (see sections 4.3 and 4.6).
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 RENICARD 50 and aliskiren is therefore contraindicated (see section 4.3). RENICARD 50 should not be used concomitantly with aliskiren (see section 4.3).
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.
Concomitant use of angiotensin receptor blockers and fluoroquinolones may precipitate acute kidney injury in patients, especially those with moderate to severe renal impairment and elderly patients (see section 4.3). Renal function should be assessed before initiating treatment and monitored during treatment with fluoroquinolones and angiotensin receptor blockers whether used separately and/or concomitantly.
Symptomatic hypotension, especially after the first dose and after increasing of the dose, may occur in patients who are volume- and/or sodium-depleted by vigorous diuretic therapy, dietary salt restriction, diarrhoea or vomiting. These conditions should be corrected prior to administration of RENICARD 50, or a lower starting dose should be used (see section 4.2).
Electrolyte imbalances are common in patients with renal impairment, with or without diabetes, and should be addressed. In a clinical study conducted in type 2 diabetic patients with nephropathy, the incidence of hyperkalaemia was higher in the group treated with losartan as compared to the placebo group (see section 4.8). Therefore, the plasma concentrations of potassium as well as creatinine clearance values should be closely monitored, especially patients with heart failure and a creatinine clearance between 30 – 50 mL/min should be closely monitored.
The concomitant use of potassium-sparing diuretics, potassium supplements, potassium-containing salt substitutes, or other medicines that may increase serum potassium (e.g. trimethoprim-containing products) with RENICARD 50 is not recommended (see sections 4.3 and 4.5).
Based on pharmacokinetic data which demonstrate significantly increased plasma concentrations of losartan in cirrhotic patients, a dose of 25 mg should be considered for patients with a history of hepatic impairment (see section 4.2).
As a consequence of inhibiting the renin-angiotensin system, changes in renal function including renal failure have been reported (in particular, in patients whose renal function is dependent on the renin-angiotensin-aldosterone system such as those with severe cardiac insufficiency or pre-existing renal dysfunction). As with other medicines that affect the renin-angiotensin-aldosterone system, increases in blood urea and serum creatinine have also been reported in patients with bilateral renal artery stenosis or stenosis of the artery to a solitary kidney; these changes in renal function may be reversible upon discontinuation of therapy. RENICARD 50 is contraindicated in patients with bilateral renal artery stenosis or stenosis of the artery to a solitary kidney (see section 4.3).
There is no experience in patients with recent kidney transplantation.
Patients with primary aldosteronism generally will not respond to antihypertensive medicines acting through inhibition of the renin-angiotensin system. Therefore, the use of RENICARD 50 is not recommended.
As with any antihypertensive medicine, excessive blood pressure decreases in patients with ischaemic cardiovascular and cerebrovascular disease could result in a myocardial infarction or stroke.
In patients with heart failure, with or without renal impairment, there is - as with other medicines acting on the renin-angiotensin system - a risk of severe arterial hypotension, and (often acute) renal impairment.
There is no sufficient therapeutic experience with losartan in patients with heart failure and concomitant severe renal impairment, in patients with severe heart failure (NYHA class IV) as well as in patients with heart failure and symptomatic life-threatening cardiac dysrhythmias. Therefore, RENICARD 50 should be used with caution in these patient groups. The combination of losartan with a beta-blocker should be used with caution.
As observed for angiotensin converting enzyme inhibitors, losartan and the other angiotensin antagonists are apparently less effective in lowering blood pressure in black people than in non-blacks, possibly because of higher prevalence of low-renin states in the black hypertensive population.
Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or glucose-galactose malabsorption should not take RENICARD 50.
Other antihypertensive medicines may increase the hypotensive action of RENICARD 50. Concomitant use with other medicines which may induce hypotension as an adverse reaction (like tricyclic antidepressants, antipsychotics, baclofen and amifostine) may increase the risk of hypotension.
Losartan is predominantly metabolised by cytochrome P450 (CYP) 2C9 to the active carboxy-acid metabolite. In a clinical trial it was found that fluconazole (inhibitor of CYP2C9) decreases the exposure to the active metabolite by approximately 50%. It was found that concomitant treatment of losartan with rifampicin (inducer of metabolism enzymes) gave a 40% reduction in plasma concentration of the active metabolite. The clinical relevance of this effect is unknown. No difference in exposure was found with concomitant treatment with fluvastatin (weak inhibitor of CYP2C9).
As with other medicines that block angiotensin II or its effects, concomitant use of other medicines which retain potassium (e.g. potassium-sparing diuretics: amiloride, triamterene, spironolactone) or may increase potassium levels (e.g. heparin, trimethoprim-containing products), potassium supplements or salt substitutes containing potassium may lead to increases in serum potassium. Co-medication is not advisable. See sections 4.3 and 4.4.
When angiotensin II antagonists are administered simultaneously with nonsteroidal anti-inflammatory drugs (NSAIDs) (i.e. selective COX-2 inhibitors, acetylsalicylic acid at anti-inflammatory doses and non-selective NSAIDs), attenuation of the antihypertensive effect may occur. Concomitant use of angiotensin II antagonists or diuretics and NSAIDs may lead to an increased risk of worsening of renal function, including possible acute renal failure, and an increase in serum potassium, especially in patients with poor pre-existing renal function. The combination should be administered with caution, especially in the elderly. Patients should be adequately hydrated, and consideration should be given to monitoring renal function after initiation of concomitant therapy, and periodically thereafter.
Clinical trial data have shown that dual blockade of the renin-angiotensin-aldosterone system (RAAS) through the combined use of ACE-inhibitors, angiotensin II receptor blockers or aliskiren is associated with a higher frequency of adverse events such as hypotension, hyperkalaemia, and decreased renal function (including acute renal failure) compared to the use of a single RAAS- acting medicine (see sections 4.3, 4.4, and 5.1).
Concomitant use of angiotensin receptor blockers and fluoroquinolones may precipitate acute kidney injury. The mechanism of the possible interaction between the different classes of medicines, over and above different mechanisms of kidney damage, is unknown (see section 4.3).
Safety in pregnancy and lactation has not been established (see section 4.3). When pregnancy is planned or confirmed RENICARD 50 should be discontinued.
Medicines affecting the renin-angiotensin system, such as RENICARD 50, can cause embryonal toxicity, foetal and neonatal morbidity and mortality when administered to pregnancy women. Women of childbearing age should ensure effective contraception.
No studies on the effects on the ability to drive and use machines have been performed. However, when driving vehicles or operating machines it must be borne in mind that dizziness or drowsiness may occasionally occur when taking antihypertensive therapy, in particular during initiation of treatment or when the dose is increased.
Frequent: Upper respiratory infection.
Frequent: Insomnia.
Frequent: Headache, dizziness, vertigo.
Less frequent: Somnolence, sleep disorders, paraesthesia.
Frequent: Palpitations, tachycardia.
Less frequent: Angina pectoris, syncope, atrial fibrillation, cerebrovascular accident.
Less frequent: Orthostatic hypotension.
Frequent: Cough, pharyngitis, nasal congestion, sinus disorder.
Less frequent: Dyspnoea.
Frequent: Diarrhoea, nausea, abdominal pain, dyspepsia.
Less frequent: Obstipation.
Less frequent: Rash.
Frequent: Back pain, muscle cramps.
Frequent: Renal impairment, renal failure.
Frequent: Asthenia/fatigue, oedema/swelling, chest pain.
Frequent: Hyperkalaemia, elevations of ALT, increase in blood urea, serum creatinine and serum potassium, hypoglycaemia.
The following adverse reactions have been reported in post-marketing experience. They are derived from spontaneous reports for which precise incidences cannot be determined, therefore the frequency is unknown:
Blood and lymphatic system disorders:
Anaemia, thrombocytopenia.
Immune system disorders:
Anaphylactic reactions, angioedema including swelling of the larynx and glottis causing airway obstruction and/or swelling of the face, lips, pharynx and/or tongue has been reported in patients treated with losartan; some of these patients previously experienced angioedema with ACE inhibitors and angiotensin receptor blockers.
Psychiatric disorders:
Depression.
Nervous system disorders:
Migraine, dysgeusia.
Ear and labyrinth disorders:
Tinnitus.
Vascular disorders:
Vasculitis, including Henoch-Schönlein purpura.
Gastrointestinal disorders:
Vomiting.
Hepatobiliary disorders:
Hepatitis, pancreatitis.
Skin and subcutaneous tissue disorders:
Urticaria, pruritus, erythroderma, photosensitivity.
Musculoskeletal and connective tissue disorders:
Myalgia, arthralgia, rhabdomyolysis.
Reproductive system and breast disorders:
Erectile dysfunction, impotence.
General disorder and administration site conditions:
Malaise.
Investigations:
Liver function abnormalities, hyponatraemia.
As a consequence of inhibiting the renin-angiotensin-aldosterone system, changes in renal function including renal failure have been reported in patients at risk. These changes in renal function may be reversible upon discontinuation of therapy (see section 4.4).
Reporting suspected adverse reactions after authorisation of RENICARD 50 is important. It allows continued monitoring of the benefit/risk balance of RENICARD 50. Health care providers are asked to report any suspected adverse reactions to SAHPRA via the "Adverse Drug Reactions Reporting Form", found online under SAHPRA's publications: https://www.sahpra.org.za/Publications/Index/8.
Not applicable.
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