不久前完成的一項PROVEN研究就指出,用過威而鋼無效的病人在改用樂威壯之後,有62%的病友認為自己的勃起功能得到了改善。這個研究很明白的告訴病友們,治療勃起功能障礙。威而鋼,改善壯陽、陽痿早洩、陽萎等症狀。

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