What is the ruling on wearing a urine guard for urine that comes out after urinating, and must one repeat the prayer if a drop of urine comes out into the guard during prayer?

The answer clarifies what one should do if urine continues to discharge after urination: one should take precautions and wait until the dripping stops. Then, one should perform istibra' (cleansing), make wudu' (ablution), and pray. If a protective barrier is used, one should wait until the flow of urine ceases, then remove it, perform istinja (definition)' (washing the private parts), make wudu', and pray. It is not permissible to wear the barrier again before washing it from impurities. If a drop of urine exits during prayer, the prayer becomes invalid and must be repeated after performing istinja' and wudu'.