Is It Necessary To Take Tamsulosin Everyday At The Same Time?

HI--I HAVE BEEN ON TAMSULOSIN FOR AWHILE NOW....LATELY MORE IRREGULARLY....SEEMS I STILL HAVE TROUBLE URINATING IN THE NIGHT. I AM FEMALE. I AM ON THE 0.4MG . IS IT IMPORTANT TO TAKE IT AT THE SAME TIME EACH NIGHT. I ONLY WAS TOLD TO TAKE IT AT NIGHT. IS THERE A CHARGE FOR YOUR ANSWERS?? THANK YOU!