Dear Jackie:The dosage is not on the bottle, believe it or not. I was taking it 2X a day for about 3 months, if that. The phenobarbital doesn't have much effect on me, other than I sleep well. I had such a bad anxiety attack at Mass last week, I thought I would lose consciousness. This really bothers me as I felt very secure on the Donnatal originally,"D" wise. But my stomach started to rumble and that sent me into a huge panic.I am not going to check with my dr. about switching back and forth. I'm just going to do it.Dear Twocups:I'll tell you what, I was on the Levbid for about 2 years and I was fine (for me), but I was having all these bladder problems so I can't take it long term anymore. Have you tried it?love, m-