Warm Acrid Herbs that Release the Exterior

What is the recommended dosage range for Xi Xin (asari radix et rhizoma)?

Xi Xin is toxic. Overdosage or too short of a boiling time can cause toxic side effects. The toxic constituent is thought to be safferole, a volatile oil which is reduced during long cooking times. Therefore, caution must be used with pills and powders. The leaves of this plant may contain aristolochic acids, so only the root and rhizome should be used.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 29-30 [Q327]