Cynanchum acidum is a species of flowering plant in the family Apocynaceae, typically found in the arid parts of peninsular[1] India where it is used in religious sacrifices.

The plant is religiously linked to Hinduism and is believed to be a major ingredient of the Soma in Ancient India.

[2] Cynanchum acidum is a perennial leafless, jointed shrub with green, cylindrical, fleshy glabrous with twining branches having milky white latex and with its leaves reduced to scales.

The plant yields an abundance of a mildly acidulous milky juice, and travellers like nomadic cowherds suck its tender shoots to allay thirst.

[3] In classical Indian medicine it is considered useful in vitiated conditions of pitta, dipsia, viral infection, hydrophobia, psychopathy and general debility.