Final answer:
Among the provided options (1), constipation is an adverse reaction to bile acid sequestrants, which are known to cause gastrointestinal side effects.
Step-by-step explanation:
The adverse reactions to bile acid sequestrants can include a range of symptoms. Of the options provided, the nurse would consider constipation as an adverse reaction to a bile acid sequestrant. This medication is known to potentially cause gastrointestinal side effects, which include constipation option (1), as part of its negative side effects. Adverse reactions such as headache, anxiety, and double vision do not appear to be directly related to the use of bile acid sequestrants.
Bile acid sequestrants are medications used to lower cholesterol by binding to bile acids in the intestine, preventing their reabsorption.