| abstract |
The present invention relates to a pharmaceutical formulation for oral administration for preventing or treating allergic rhinitis or asthma, which comprises: (a) a compound comprising levocetirizine or a pharmaceutically acceptable salt thereof; a first particle portion of an organic acid; and (b) a second particle portion comprising Montelukast or a pharmaceutically acceptable salt thereof. The pharmaceutical formulation according to the present invention comprises an organic acid as a stabilizer which is effective for inhibiting the production of levocetirizine and Montelukast related substances and, therefore, exhibits good stability. |