Final answer:
The potential adverse effects of metaproterenol include an irregular heartbeat and potentially a decreased pulse rate, but not typically constipation or pedal edema.
Step-by-step explanation:
The potential adverse effects of metaproterenol (Alupent) when prescribed via metered-dose inhaler include irregular heartbeat, which refers to arrhythmias, and potentially a decreased pulse rate, although the latter is less common as metaproterenol typically causes tachycardia, not bradycardia. Metaproterenol is a beta-2 adrenergic agonist, so it mostly affects the respiratory system to induce bronchodilation. However, it can have cardiovascular effects due to some overlap with beta-1 adrenergic receptors. Adverse effects such as constipation and pedal edema are not typically associated with this class of medication. If a client experiences an irregular heartbeat or any other concerning symptoms, they should contact their healthcare provider immediately.