This is Not a Medical opinion but during one obstruction I tried injectible gravol (the seasickness med). I keep it in the house because I have serious periods of dizzy spells and it is the only thing that calms things down and allows me to sleep...it also prevents my intestines from going into overdrive (I use the pill form when I travel to keep my pouch in check)...so I figured that I would try it. It worked. It does not help open up the occlusion but calms the contractions and pain.
I keep the kind that dissolves under the tongue and the child's liquid kind on hand at all times (I get blockages and full-blown obstructions on a regular basis)...when I have a full-blown obstruction I cannot take anything by mouth or my body goes into wild spasms of pain and contractions...that is when I use the injectable kind.
My G.P now prescribes it to me for this reason. For the less severe blockages, I use normal pills or dissolvable pills. I have no preference for brands, generics are fine.