seven categories of medications suitable as errhines for purification of head mentioned in Rogabhishagjitiya Vimana may be used as powder and in oil base for purification. The drugs of sweet category mentioned in the that chapter may be used for tarpana (nourishing).
साधयित्वा भिषक् स्नेहं नस्तः कुर्याद्विधानवित्प्राक्सूर्ये मध्यसूर्ये वा प्राक्कृतावश्यकस्य च||९८||
With these mentioned drugs the sneha should be prepared and used by the physician who is skillful in the errhine therapy. [Procedure of nasya therapy] Tarpana sneha nasya should be administered into the nostrils of a patient in the early morning
दद्यान्नासापुटे स्नेहं तर्पणं बुद्धिमान् भिषक्| अनवाक्शिरसो नस्यं न शिरः प्रतिपद्यते||१००||
If the head is not lowered at all, the medication does not reach the head. If the head is excessively lowered the nasya medication may reach into the brain.