Yes, Tadfil 20 mg, which contains the active ingredient tadalafil, is effective for treating erectile dysfunction (ED). Tadalafil is a type of phosphodiesterase type 5 (PDE5) inhibitor, which helps increase blood flow to the penis to help a man get and maintain an erection. 

Tadfil 20 mg is typically taken as needed before sexual activity. It can start working within 30 minutes, and its effects can last up to 36 hours. This longer duration of action is one of the distinguishing features of tadalafil compared to other ED medications.

It's important to use Tadfil under the guidance of a healthcare provider to ensure it's appropriate for your health condition and to discuss any potential side effects or interactions with other medications you might be taking. If you have any concerns or experience any adverse effects, you should consult your healthcare provider.

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