Figure 5:Typical HPLC chromatograms obtained from Losartan under stress conditions: 1- Dry powder under heat. 2- Methanolic solution under heat. 3- Dry powder under light. 4- Methanolic solution under light. 5- Methanolic solution under 1.0 M HCl at 70°C. 6- Methanolic solution under 3.0 % H2O2 at 25°C. 7- Methanolic solution under 1.0 M NaOH at 70°C.