Honestly, I do not know whether or not lactose is an ingredient in Gravol. I don't have a package with ingredient listings handy to check.
I've been using a generic version at the moment AND as we all know often generic drugs (i.e. generic/storebrand Immodium) will often contain different additives/non-medicinal ingredients. The bottle I have doesn't list lactose. These pills are very very tiny. If anyone knows, please advise. I will attempt to find out.
I do note, though, that D has decreased since ceasing Nexium. Thank Goodness.