A hospitalized patient has been prescribed dexamethasone (Decadron) for an allergic reaction. Which teaching instruction should the patient be given with discharge relative to this drug?

A. Take this medication with meals: Dexamethasone is a corticosteroid that can cause gastrointestinal irritation and increase the risk of peptic ulcers. Taking it with food helps protect the stomach lining. B. Do not operate heavy machinery: This is a precaution for sedatives or opioids. Steroids often cause "insomnia" or "euphoria," but not usually sedation that impairs machinery operation. C. Take the medication on an empty stomach: This would increase the risk of gastric upset and ulceration. D. Report blurry vision: While long-term steroid use can cause cataracts or glaucoma, it is not the most immediate or common discharge instruction compared to GI protection.