I don't know, but I know reptile calcium supplements are often made from calcium carbonate (sam thing as Tums), which is actually a poorly absorbed source of calcium, and also acts as an antacid. My guess would be that it is neutralizing things excessively, and hence causing digestive problems.
Most constipation problems in reptiles are caused from ingesting excess amount of indigestible matter. Some arboreal snakes are sensitive to constipation as as a result of improper feeding or husbandry. I don't know of any lizards or amphibians that are generally more sensitive to those type of situations than others. Maybe someone else will be able to shed light on that.
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