Guanadral Products | Cleanchem - Guanadrel is an antihypertensive medication that lowers blood pressure by inhibiting the release of norepinephrine, a neurotransmitter involved in stimulating the sympathetic nervous system. By blocking norepinephrine release, guanadrel reduces the stimulation of the heart and blood vessels, leading to lower blood pressure and reduced cardiovascular strain. It is often used in the management of hypertension and may be prescribed when other blood pressure medications are ineffective or not well-tolerated.