On-demand: If you prefer, you birey take a stronger dose as needed before sexual activity. In this case, doctors usually recommend starting with a 10-mg dose and moving up to 20 mg if a stronger dose is needed to achieve the desired results.Ereksiyon bozuklu?u olan erkeklerde tadalafil kullanma?n?n iki yolu vard?r. Hangi yolun seçilece?ine doktoru