A recent study published in the Journal of Urology showed a surprising benefit for Cialis (tadalafil) users.  Men using a lower daily dose of the ED medication (2.5 or 5mg) were shown to have statistically significant improvement in troublesome urinary symptoms such as waking up at night to urinate (nocturia), urinary frequency, and poor bladder emptying.  The mechanism for this action is not well understood at present.

In the future, combination drugs which target ED and prostate symptoms (including possible protective or preventative therapy directed against prostate cancer)  are likely to be investigated.