I suffer from IBS and have been prescribed Lomotil and Donnatal elixir to treat my symptoms for about 10 years. Unfortunately when I lost my health insurance I had to stop taking it. It's been about 5 years since I have taken it. I was just prescribed a bottle of Lomotil and Donnatal (the Lomotil is 2.5 mg). I do not remember how many mg I have been prescribed in the past. These seem to do the trick (definitely an improvement from Imodium!) but sometimes it seems like it doesn't knock it out as fast as what I was given years ago. Can someone please let me know what the standard dosage is for Lomotil? Is 2.5 mg the maximum dosage amount for this medication?