A nurse is preparing to administer exenatide for a client who has type 2 diabetes mellitus. Which of the following routes of administration should nurse plan to use?

The client statement that indicates an understanding of the teaching is: "The medication can cause drowsiness."

Promethazine is an antihistamine medication commonly used to treat various conditions, such as allergies, motion sickness, and nausea. One of the most common side effects of promethazine is drowsiness or sedation. It has a significant sedative effect, and it is often used to induce sleep or manage insomnia in some cases.

Let's go through the other options:

A. "This medication can cause diarrhea": Diarrhea is not a common side effect of promethazine. While promethazine can cause certain gastrointestinal side effects like constipation or upset stomach, diarrhea is not typically associated with its use.

B. "The medication can cause increased salivation": Increased salivation is not a common side effect of promethazine. While some antihistamines can cause dry mouth, which is the opposite of increased salivation, promethazine does not usually cause excessive salivation.

C. "This medication can cause pupil constriction": Pupil constriction (miosis) is a potential side effect of some medications, but it is not commonly associated with promethazine. Promethazine is more likely to cause pupil dilation (mydriasis) rather than constriction.

Oxybutynin is an anticholinergic medication commonly used to treat urinary incontinence. One of the adverse effects of anticholinergic medications is the potential for bradycardia, which refers to a slower than normal heart rate. Anticholinergic medications can inhibit the effects of acetylcholine, a neurotransmitter responsible for regulating various bodily functions, including heart rate. Therefore, it is important to assess the client for signs of bradycardia after an unintended higher dose of oxybutynin.

Increased salivation (A) is not an expected adverse effect of oxybutynin. In fact, anticholinergic medications like oxybutynin often have the opposite effect, causing dry mouth and reduced salivation.

Hyperthermia (B) is not a typical adverse effect of oxybutynin. It is more commonly associated with other conditions or medications.

Urinary incontinence (C) is the condition that oxybutynin is intended to treat. It is not an adverse effect but rather the therapeutic effect of the medication.