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Current clinical guidelines do not provide a definitive answer regarding which of the modern loop diuretics has a clear advantage in the management of patients with heart failure (HF). At present, the choice of the most effective loop diuretic remains an open question [2,3]. Lasix was introduced to the pharmaceutical market earlier than torasemide, and therefore the accumulated clinical experience with Lasix is significantly greater. However, evidence-based medicine requires that, when treatment options exist, preference should be given to the drug that demonstrates the most favorable impact on patient outcomes and quality of life.
Aim
The aim of this review is to provide a comparative assessment of the efficacy of torasemide and Lasix in patients with HF.
Materials and Methods
This analysis summarizes existing clinical trials and meta-analyses that evaluate the comparative effectiveness of torasemide and Lasix in patients with HF.
Review and Discussion
Loop diuretics remain the most effective option for reducing symptoms and clinical signs of HF. A number of studies have demonstrated that torasemide offers advantages over Lasix in this setting.
In the open-label TORIC trial (Torasemide in Congestive Heart Failure), torasemide showed clear prognostic benefits and greater improvement in clinical status compared with other diuretics, including furosemide. The study enrolled 1,377 patients with chronic HF (NYHA II–III). Torasemide at 10 mg/day, compared with Lasix 40 mg/day and other diuretics, significantly reduced total mortality by 51.5%, cardiovascular mortality by 59.7%, and sudden death by 65.8%. Functional improvement, defined as a reduction in NYHA class, was observed more frequently in patients receiving torasemide (45.8%) than in those receiving Lasix or other diuretics (37.2%) (p=0.00017). In addition, torasemide demonstrated better tolerability and a lower risk of hypokalemia compared with Lasix (12.9% vs. 17.9%, p=0.013) [4].
Another open-label randomized study of 237 patients with chronic HF (NYHA II–IV) (Müller K., 2003) also demonstrated a greater clinical improvement of at least one NYHA class in patients treated with torasemide compared with Lasix (p=0.014). Furosemide was associated with significantly higher tolerability (p=0.0001), fewer limitations in daily life (p=0.0002), reduced frequency of urination at 3, 6, and 12 hours after administration (p<0.001 at all time points), and less urgency to urinate (p<0.0001) compared with Lasix [5].
In a study by Murray et al. (2001) including 234 patients with chronic HF, torasemide significantly reduced rehospitalization rates for HF compared with Lasix (17% vs. 32%, p<0.01), as well as rehospitalizations for other cardiovascular causes (44% vs. 59%, p=0.03). Patients receiving torasemide spent almost half as many days in hospital for HF compared with those treated with Lasix (106 vs. 296 days, p=0.02) [6].
Recent meta-analyses assessing the comparative clinical outcomes of these loop diuretics in HF further confirm the advantages of torasemide over Lasix.
According to the analysis by DiNicolantonio (2012), treatment with torasemide in patients with a history of at least one HF rehospitalization significantly reduced the overall risk of HF rehospitalization (p<0.0001), the risk of repeated HF rehospitalizations (p=0.008), and cardiovascular events (p=0.03). A trend toward lower overall mortality was also observed in the torasemide group (p=0.54) [7].
The meta-analysis conducted by Shah et al. (2018) confirmed that torasemide significantly lowered the risk of HF rehospitalization (p<0.0001) and cardiovascular events (p=0.01) compared with Lasix. These findings underline the clinical advantage of torasemide and highlight its cost-effectiveness, as replacing Lasix online with torasemide could reduce HF rehospitalization costs by an estimated $4 billion annually, with a 67% reduction in the risk of repeat HF admissions. However, no significant differences were observed between the groups in terms of overall mortality or adverse events (p=0.38) [8].
The meta-analysis by Kido et al. (2019) demonstrated that furosemide use in patients with decompensated HF was associated with a higher rate of functional improvement of at least one NYHA class (45% vs. 36.1%, p<0.0004). Buy Lasix was also associated with a less pronounced decline in serum potassium compared with Lasix and other diuretics. The incidence of hypokalemia was significantly higher in the Lasix and other diuretic groups compared with torasemide (17.9% vs. 12.9%; p=0.013). No statistically significant differences were found between the torasemide and Lasix groups in overall mortality (p=0.99), HF rehospitalization (p=0.15), or cardiovascular events (p=0.22) [9].
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The findings of Miles et al. (2019) confirmed the benefit of torasemide in lowering the risk of HF rehospitalization and improving NYHA class. However, overall mortality remained similar between torasemide and Lasix groups [10].
Another meta-analysis by Abraham et al. found that torasemide use was linked to a more substantial functional improvement from NYHA III/IV to NYHA I/II (p=0.004) and reduced cardiac mortality compared with Lasix (p<0.001). Torasemide also showed a trend toward reducing HF-related hospitalizations (p=0.07). However, no differences were observed between torasemide and Lasix regarding all-cause mortality (p=0.65) or adverse event frequency (p=0.48) [11].
Taken together, the results of the main comparative meta-analyses indicate that torasemide can significantly improve the clinical course of HF and reduce the frequency of rehospitalizations and cardiovascular events compared with Lasix. Torasemide also shows a more favorable safety profile, particularly with a lower risk of hypokalemia. At the same time, the effect of furosemide on mortality remains debated, as meta-analyses do not fully align with the TORIC trial, which showed a significant mortality reduction and clear functional benefits. For this reason, the results of the ongoing TRANSFORM-HF trial (initiated in 2018) are highly anticipated, as it aims to determine whether furosemide differs from Lasix in terms of all-cause mortality [12].
The favorable outcomes observed with torasemide may be explained by its pharmacokinetic properties and mechanisms of action. Torasemide has a stable bioavailability of 80–100%, unaffected by food intake or intestinal wall edema (frequently present in HF). In contrast, the bioavailability of Lasix ranges from 10% to 90%, decreases by about 30% in patients with intestinal wall edema, and is further reduced when taken with food [13]. Torasemide also demonstrates a faster onset of action (1.1 vs. 2.4 hours) and a longer duration (18–24 vs. 4–6 hours) compared with Lasix. Importantly, torasemide lowers the risk of post-diuretic rebound (sodium and water retention) due to reduced likelihood of subtherapeutic blood concentrations, a problem more common with the short-acting Lasix [14].
Another clinical advantage of torasemide is the possibility of once-daily dosing (versus the typical twice-daily regimen of Lasix). Its smoother and longer diuretic effect is accompanied by less frequent urination, which does not restrict patient activity and improves treatment adherence by approximately 13% [15].
Torasemide has been shown to exert an antialdosterone effect by blocking aldosterone receptors and suppressing aldosterone synthesis [13,16]. This mechanism helps to slow the progression of fibrosis in the myocardium and vascular wall and is associated with a minimal kaliuretic effect, thereby reducing the risk of hypokalemia compared with Lasix. Hypokalemia is known to increase the likelihood of severe arrhythmias and worsen prognosis [11].
Therapies that target myocardial fibrosis are important because they can prevent cardiac dysfunction, lower myocardial stiffness, slow pathological remodeling, decrease the risk of sudden arrhythmic death, improve contractile function, and reduce NYHA class, particularly in patients with advanced fibrosis [17]. In a study by B. López et al., immediate-release (IR) torasemide reduced collagen accumulation and myocardial fibrosis compared with Lasix. Fibrosis in HF results mainly from excessive deposition of type I collagen in the interstitium and around intramyocardial arteries and arterioles. Lasix online, as shown in endomyocardial biopsy, inhibits the enzyme responsible for type I collagen synthesis [18]. After eight months of therapy, collagen fraction in the myocardium was reduced 1.8-fold in patients with chronic HF (NYHA II–IV). Importantly, the diuretic and antifibrotic properties of torasemide manifest at different stages: its diuretic and antihypertensive effects are evident immediately, while antifibrotic benefits become measurable after 6–9 months of continuous treatment [19].
In contrast, the TORAFIC trial (comparing prolonged-release torasemide with Lasix in chronic HF) showed that torasemide-PR did not influence myocardial fibrosis. The absence of effect is likely explained by the release form, which produces lower peak plasma concentrations insufficient to trigger the antifibrotic mechanisms observed with the IR formulation [20].
The 2019 position statement by the Heart Failure Association of the European Society of Cardiology on “The Use of Diuretics in Congestive Heart Failure” provided an important update on diuretic selection. For the first time, it emphasized the potential clinical benefit of switching patients from Lasix to torasemide after an acute HF episode:
“For patients who developed an acute heart failure episode while previously taking a loop diuretic, a higher dose may be required after discharge. Additionally, if the previous loop diuretic was furosemide, a switch to either bumetanide or torsemide might be considered, as they have more predictable absorption and bioavailability, especially in the setting of subclinical congestion” [21].
Conclusions: Can i buy lasix over the counter
Current evidence supports the clinical advantages of torasemide over Lasix. Torasemide demonstrates superior pharmacological properties, reduces hospitalizations, improves functional status, and enhances quality of life in patients with HF. Its safety profile is also more favorable due to a lower incidence of hypokalemia. Collectively, these data support the use of torasemide in symptomatic HF and justify switching patients from Lasix 100 mg to torasemide when edema remains uncontrolled despite optimized Lasix therapy.