The efficacy of powdered castor seed is to benefit dampness and remove turbidity, etc.; its function is to treat rheumatism and paralysis, ointment and lymph, etc.; the contraindications are not clear at the moment, and it is used with caution for those who have spermatorrhea and syncope due to deficiency of kidney yin. Powdered castor seed is bitter in taste and flat in nature, belonging to the kidney meridian and stomach meridian, with the efficacy of inducing dampness and removing turbidity, dispelling wind and removing paralysis, and it is suitable for the treatment of rheumatism and joint pain, joint flexion and extension disadvantage (the function of joint extension and bending abnormality), lumbar and knee pain, excessive discharge, and ointment lymph (the urine is turbid as rice soup or slippery as grease, with urinary frequency and urgency, and abdominal traction and discomfort) and other diseases. However, it is prudent to use powdered dioscorea for those who suffer from spermatorrhea and seminal emission due to deficiency of kidney yin, and the adverse reactions and contraindications of taking powdered dioscorea are not clear for the time being. Powdered castor oil needs to be used under the guidance of a professional Chinese medicine practitioner to identify the evidence, do not use blindly.