I have been taking this for over a year. It is Hyoscyamine with a new name. It is great, works quite well. But, it makes me very groggy the next day. I had to go back to bed this morning at 8am, and did not get back up until noon. I would take one half and see how that works. I used to take these twice a day,and honestly, I have no clue how I got up and got things done.
I am trying to manage this ibs without meds, unless terribly necessary. I seem to be in a lot of paint these days.
hope this helps