You would need to get checked out what is causing your double urine flow.
This could be to do with a urinary infection, uncontrolled diabetes or a prostate problem.
Make an appointment to see your doctor and take a urine sample with you.
A doctor can prescribe medication to reduce the urine flow if he felt you needed this. My husband stopped taking it because it gave him side effects.
You could try a homeopathic remedy called Thuja which has good success in treating this problem.