10.22376/ijpbs.2019.10.1.p1-12 Volume 9 Issue 2 2018 (April-June) Siddha system of medicine is one of the oldest traditional systems originated from Tamil Nadu. The Siddha herbomineral drug Kandhaga Rasayanam is chosen from classic Siddha text lessThan i greaterThan Siddha Vaithya Thirattu lessThan /i greaterThan .Kandhagam is the sole mineral ingredient in the formulation. lessThan i greaterThan Withania somnifera lessThan /i greaterThan Dunal, lessThan i greaterThan Smilax china lessThan /i greaterThan Linn,. lessThan i greaterThan Terminalia chebula lessThan /i greaterThan Retz., lessThan i greaterThan Phyllanthus emblica lessThan /i greaterThan Linn., lessThan i greaterThan Terminalia bellerica lessThan /i greaterThan Roxb., lessThan i greaterThan Zingiber officinale lessThan /i greaterThan Roscoe , lessThan i greaterThan Piper longum lessThan /i greaterThan Linn., lessThan i greaterThan Piper nigrum lessThan /i greaterThan Linn., lessThan i greaterThan Embelia ribes lessThan /i greaterThan Burm, lessThan i greaterThan Elataria cardamomum lessThan /i greaterThan Linn., lessThan i greaterThan Cinnamomum zeylanicum lessThan /i greaterThan Breyn, lessThan i greaterThan Santalum album lessThan /i greaterThan Linn., lessThan i greaterThan Cicer arietinum lessThan /i greaterThan Linn., lessThan i greaterThan Semecarpus anacardium. lessThan /i greaterThan Linn , lessThan i greaterThan Plumbago zeylanica. lessThan /i greaterThan Linn., are the herbal ingredients.The raw drugs are purified and the formulation was as per the methods described in literature.It is indicated for various type of arthritis, venereal diseases, urinary infections, skin infections, etc.; Standardisation of Siddha drugs is the need of the hour. Physicochemical analysis,HPTLC studies, acute and long term toxicity of Kandhaga Rasayanam are already published.The aim of the present study is to characterize the Siddha formulation Kandhaga Rasayanam using Fourier Transform Infra Red Spectroscopy (FT-IR)and Thermogravimetric Analysis (TGA). FT-IR spectra was recorded using a Fourier Transform Infrared spectrometer, model FTIR- 6300, JASCO International Company, Japan.The FT-IR spectroscopy applied in the mid infra-red region 4000 cm lessThan sup greaterThan -1 lessThan /sup greaterThan to 400 cm lessThan sup greaterThan -1 lessThan /sup greaterThan revealed the presence of O-C=O bending, -CH lessThan sub greaterThan 2 lessThan /sub greaterThan out of plane, -CN stretching, -COO stretching in carboxylic, -CH lessThan sub greaterThan 2 lessThan /sub greaterThan in aliphatic compounds, =CH in aromatic compounds, -OH stretching etc. Thermal properties of the drug sample were investigated on a Thermo Gravity instrument Q-500 model. At 910ºC,4.640 % of the drug was disintegrated.The FTIR analysis and TGA has showed various aliphatic, aromatic and saturated compounds. Kandhaga Rasayanam is a heat stable herbomineral formulation profile. Further studies have to be carried out to standardize the formulation. MEENA .R, RAMASWAMY.R.S Kandhaga Rasayanam, Fourier Transform Infrared Spectra Thermogravimetric Analysis, Siddha, Herbomineral formulation. 148-152