What is the drug class of Guanfacine Hydrochloride?

Guanfacine Hydrochloride is classified as an antihypertensive and also serves as a treatment for attention-deficit/hyperactivity disorder (ADHD). As an antihypertensive, it works by stimulating alpha-2 adrenergic receptors in the brain, which leads to a decrease in sympathetic outflow, resulting in lowered blood pressure. Regarding ADHD treatment, Guanfacine helps to improve attention and decrease impulsiveness and hyperactivity by affecting receptors in the prefrontal cortex of the brain.

The other options do not accurately describe Guanfacine's primary functions. Antiallergic agents are designed to treat allergic reactions and symptoms, anticonvulsants are intended to manage seizure disorders, and diuretics are used to increase urine production to reduce fluid retention or manage blood pressure. None of these classes pertain to the dual role of Guanfacine as effective for hypertension and ADHD.