Tadarise 40 mg is different from sildenafil. Tadarise 40 mg: contains tadalafil, a PDE-5 inhibitor. Sildenafil: is the active ingredient in medicines such as Fildena, Vigora, Silagra, Malegra and Eriacta. Duration: tadalafil can remain effective for up to 36 hours, whereas sildenafil is generally used about 1 hour before sex and has a shorter duration of action. N nhs.uk +1 Dose: For ED, standard guidance uses tadalafil 10 mg initially, increasing to 20 mg if needed. A 40 mg tadalafil dose is above the usual maximum for ED and shouldn't be taken without medical supervision. H HWE Clinical Guidance +1 Do not take Tadarise 40 mg together with sildenafil (Fildena/Vigora/Silagra/Malegra/Eriacta) because combining PDE-5 inhibitors can increase adverse effects and blood-pressure lowering. If you're choosing between Tadarise 20/40 mg and sildenafil 50/100 mg, I can compare which is stronger, how long each lasts, and which is generally safer for a first-time user.