Final answer:
Dry mouth is a common side effect of Tacrine.
Step-by-step explanation:
The correct statement by the family that would indicate an understanding of the side/adverse effects related to Tacrine is a. Dry mouth is a common side effect of Tacrine. Dry mouth is a commonly reported side effect of Tacrine, which is an acetylcholinesterase inhibitor used to treat Alzheimer's disease. Other common side effects that may occur include nausea, vomiting, and diarrhea.