Prepared Dragon's Bone Classic Formulas … Natural Herb Library

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Calms the spirit and settles agitation ... Duan Long Gu is classically used for insomnia, fright, anxiety, dream-disturbed sleep, and palpitations when the spirit is unanchored.
Anchors floating Yang and subdues restlessness ... it is chosen when dizziness, irritability, or upward disturbance need a heavy settling mineral.
Astringes leakage ... compared with Long Chi, Long Gu is more strongly associated with spontaneous sweating, seminal leakage, uterine discharge, and other patterns of instability.

Gui Zhi Jia Long Gu Mu Li Tang (桂枝加龙骨牡蛎汤) ... classic formula for deficiency agitation, dream-disturbed sleep, and seminal leakage with an unanchored spirit.
Long Gu with Mu Li and Suan Zao Ren ... common strategy for insomnia, spontaneous sweating, and spirit disturbance.
Long Gu with Fu Shen and Yuan Zhi ... traditional approach when palpitations and fright predominate.

Traditional materia medica describe Long Gu as sweet, astringent, and neutral, entering the Heart, Liver, and Kidney to calm the spirit and secure leakage.
Preparation changes handling and practicality more than therapeutic identity ... the herb remains defined by its heavy settling and stabilizing nature.
PREPARATION NOTE: Duan Long Gu refers to processed or calcined Os Draconis material used medicinally, not to a different fossil medicine from Long Gu.