Answer:
Aricept and Colace.
Step-by-step explanation:
Aricept – Aricept contains Donepezil which is used to treat dementia associated with "Alzheimer’s disease". It is an "enzyme blocker" that restores the "neurotransmitters in the brain". Diarrhoea has been reported as side effect of the drug.
Colace – Colace is a "stool softener" used to "treat constipation". It makes stool softer and easier to pass by "increasing the amount of water" absorbed from stools in the gut. Diarrhoea is a known side effect of colace.
Often side effects are observed when "certain drugs interact with each other". However, the medications are prescribed when their benefits far outweigh the side effects.