Final answer:
An overdose of metoprolol (Lopressor), a β-blocker, can cause side effects such as bradycardia (slow heart rate) and even stoppage of the heart, along with hypotension, lethargy, and dizziness.
Step-by-step explanation:
The patient is prescribed metoprolol (Lopressor), which is a type of β-blocker used to treat high blood pressure and other heart-related conditions. If too much of the medication is taken, the side effects can include symptoms related to its action on the heart and blood vessels. Specifically, metoprolol works by blocking the β1-receptors in the heart, which can lead to a decrease in heart rate. Therefore, one likely side effect of an overdose of metoprolol is bradycardia, which is a slower than normal heart rate.
Additionally, in severe cases, an overprescription of metoprolol could lead to stoppage of the heart. Other possible side effects from taking too much metoprolol include lethargy, dizziness, hypotension (low blood pressure), difficulty breathing, and fainting. It's important for patients to follow their prescribed dosage to avoid these potentially dangerous side effects.