Siddha Drugs are natural products obtained from herbs, metals, minerals and animal kingdom. With the growing awareness of health care and safety aspects, people are moving towards herbal products. Proper standardization of drug preparation method as well as chemical analysis of traditional formulation is mandatory to gain support for its use worldwide. Aadhathodai chooranum is a siddha sastric drug for the treatment of Bronchial Asthma. Literature review evidenced no standardization work so far. The present study was carried out to standardize Aadhathodai Chooranam by evaluating its organoleptic properties, preliminary phyto chemical screening, physico chemical analysis, Thin Layer Chromatography (TLC), High Performance Thin Layer Chromatography (HPTLC) finger print, heavy metal analysis, Microbial load and Aflatoxin content for further application in clinical trial of bronchial Asthma. The loss on drying at 105°C, Ash, Acid insoluble Ash, Water soluble extractive, Alcohol soluble extractive and pH of Aadathodai Chooranam were 11.16%.