Answer
You did not state how often you experience urine drops in order for us to determine whether you are a Ma?zoor or not. If you experience urine drops so often that you are unable to perform two Rakaats Salaat before the next urine drop, then you are a Ma?zoor (excused person).
If you are a Ma?zoor, then one Wudhu for an entire Salaat time will suffice inspite of the repeated urine drops. Upon the expiry of a Salaat time, the Wudhu will terminate and a new Wudhu will be necessary. Kindly find attached for more information on the laws of the Ma?zoor.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai