Final answer:
The toxicities of adrenoceptor agonists can include hypertension and tachycardia, with the effects varying based on the specific receptors they target. Beta-blockers can also cause bradycardia.
Step-by-step explanation:
The toxicities of adrenoceptor agonists, which are drugs that simulate the action of the sympathetic nervous system, can include various effects, depending on the type of receptor they primarily act upon. Adrenoceptor agonists acting primarily on beta-adrenergic receptors can lead to tachycardia, an increase in heart rate, and potentially to hypertension, where the blood pressure rises significantly. On the other hand, alpha-adrenergic agonists may cause vasoconstriction of blood vessels. It's important to note that the use of beta-blockers can sometimes lead to bradycardia, or a slowing of the heart rate, which can be a therapeutic effect but can be dangerous if it leads to an abnormally slow heart rate. Overall, the most common toxic effects of adrenoceptor agonists could be described as hypertension and tachycardia, as these drugs generally cause an increase in sympathetic activity.