Filitra 40 mg contains Vardenafil, which is a potent PDE5 inhibitor used to treat erectile dysfunction (ED). Here’s why it’s considered strong: ***** of Vardenafil: Vardenafil is often considered more potent on a milligram-to-milligram basis compared to other ED drugs like Sildenafil (found in Viagra). Even at 10-20 mg doses, it has a strong effect. So, a 40 mg dose of Filitra is a high dose, making it quite powerful. Dose strength: Most Vardenafil products come in doses of 5 mg, 10 mg, or 20 mg. A 40 mg dose is double the usual maximum recommended dose and should only be taken under strict medical supervision. Duration and efficacy: Vardenafil tends to have a quick onset and strong effect on erectile function, which may make higher doses more effective but also increase the risk of side effects. Risk of side effects: Higher doses like 40 mg can increase the chance of side effects such as headache, flushing, dizziness, nasal congestion, or even more serious effects. Important: Because 40 mg is a high dose, it is generally reserved for men who have not responded to lower doses and only under medical guidance. Never self-medicate with high doses due to risks involved.