I Am Suffering From Cold And Blockage Of Nose For

I am suffering from cold and blockage of nose for the past five days, I have also have severe gastritis and cannot take anibiotics and allergy medicine of any type as it creates excess gas in my stomach. Doctor here in GUWAHATI (INDIA) has prescribed Montelukast Sodium & Levocetrizine Hydrocloride Tablets and Levoday (Levofloxacin Tablets) antibiotics. I have taken one antibiotics yesterday and today I have severe gas, that sir will it be safe to take Montelukast Sodium & Levocetrizine for me?