Interesting thing that I realised is that we should not prescribe hyoscine (commonly known as buscopan) together with metoclopramide (maxalon). The reason is because hyoscine is an anti-spasmodic medication which stops abdominal cramps, and metoclopramide has prokinetic properties which helps with gastric emptying (therefore, prevents vomitting).
When you take both of them together, their properties are negated and none of them works! Or they might not work as well as if you take either one on its own!