Final answer:
The nurse should instruct the patient to swallow the medication whole with water when taking extended-release verapamil. Crushing or chewing the medication is not recommended. Taking the medication with or without food is acceptable.
Step-by-step explanation:
The nurse should instruct the patient to swallow the medication whole with water when taking extended-release verapamil. Crushing the medication before swallowing or chewing it would alter the drug delivery system, which is specifically designed for extended-release. Taking the medication on an empty stomach is not necessary. The patient can take it with or without food, as directed by their healthcare provider.