Bisacodyl - I had heard taking the bisacodyl pill could cause kidney or liver damage?

Bisacodyl is a stimulant laxative used to treat constipation or to cleanse the bowels before surgery or a procedure. Used appropriately, as directed, bisacodyl is safe.

Used inappropriately for prolonged periods or in higher than recommended doses can lead to chronic diarrhoea, low potassium levels and an imbalance in the amount of fluid and salts (electrolytes) in your body. This can cause kidney problems.
Prolonged, excessive use may also make your constipation worse in the long-term, as your gut can become reliant on the laxative.
You should see your doctor if this sounds like you.