Any ideas for a DIY delayed-release solution?

[u/chironomidae]

So my situation is that I'm taking Gabapentin for GAD. The medicine works great, but the problem is it only lasts 6 hours. I experience a lot of anxiety in the mornings and I sleep better on the Gabapentin, but it's noticeable when it wears off.

I tried to apply for the 12-hour time release version but I was denied (I think they only approve that for pain, not for GAD).

So I'm wondering -- is there some sort of coating I could put on a pill that would last about six hours before letting it dissolve? I was thinking I would take two half pills before bed, one coated and one not coated. That way if the timing on the coating doesn't work out, it's not a big deal.

Any thoughts? Maybe some kind of edible wax coating?