A nurse is providing teaching to a client who has a gastric ulcer and a new prescription for ranitidine. Which of the following statements by the client indicates an understanding of the teaching?

The correct answer is B: "I should not take an antacid within 1 hour of taking this medication." This statement indicates understanding because ranitidine is an H2 receptor antagonist that works by reducing stomach acid production. Antacids can interfere with its absorption, so taking them together can decrease its effectiveness. Choice A is incorrect because aspirin can aggravate gastric ulcers. Choice C is incorrect as fine hand tremors are not a common side effect of ranitidine. Choice D is incorrect because there is no need to avoid dairy products with ranitidine.