lomotil isn't an antispasmodic as much as it's a colonic immobiliser.
I use dicyclomine (Bentylol in Canada..Bentyl in the US)..it comes in 10mg and 20mg dosages.
I've used it for over 19 years...a miracle in a bottle for me.
Does the Bentyl dry you out like a hot vegas day? It would be a nice switch to find something that would do the same thing without that side affect.