The drug for hypertension is obtained from:

Rauwolfia (Rauvolfia serpentina) is a medicinal plant that contains reserpine, an alkaloid used historically to treat hypertension and other cardiovascular conditions. The plant has been used in traditional Indian medicine (Ayurveda) for centuries. Modern antihypertensive drugs have largely replaced reserpine due to its side effects, but it remains important in medical history. Other options - Sida, Neem (Azadirachta indica), and Tulsi (Ocimum tenuiflorum) - have medicinal uses but not primarily for hypertension.