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Ashtanga Hridayam, Uttarasthana 33.14
Ashoka stambhano vishishtah... Artavarogaghni -- Ashoka is the foremost Stambhana (astringent/flow-reducing) herb and specifically Artavarogaghni (destroyer of Artava/menstrual disorders). Its cold potency and bitter-astringent taste directly reduce excess Pitta-Rakta in the Artava Vaha channels.

Classical documentation

Charaka Samhita and Ashtanga Hridayam both document Ashoka bark as the primary herb for Artava Kshaya complications, Raktapradara (excessive menstrual bleeding), Shweta Pradara (white vaginal discharge -- leucorrhoea), and Yoniroga (uterine conditions). The Stambhana (astringent, styptic) action is documented as primary -- reducing excess flow through the direct astringent action on the mucosal tissue of the uterine and vaginal channels. The Sheeta Virya reduces the Pitta-Rakta heat that drives excess Artava.

Modern pharmacological research documents Ashoka bark extracts with uterotonic activity (different from the astringent-styptic classical action -- both mechanisms appear to be present), oestrogenic activity from the isoflavone fraction, and anti-inflammatory effects.

Ashokarishta -- the primary formulation
Ashokarishta is a fermented Arishta preparation with Ashoka as the primary herb, documented in Sharangadhara Samhita for Artava conditions, leucorrhoea, and uterine health. It is among the top-prescribed Ayurvedic preparations for women's health in modern clinical practice. API specifies quality standards including minimum Ashoka bark content and alcohol range.