HELLO, NO OPTION, PROFESSIONAL HAZARD NO DOCTOR CAN TREAT AS REQUIRED IS QUITE THE JOB. SO NEXT TIME DON'T CONSULT FOR THIS. CETRIZINE IS LIGHT DOSE. LOT OF PEOPLE HAVE TO USE WHOLE MONTH OR MONTHS AS AFTER AROUSE FROM BED SNEEZING STARTED. SO YOU CAN THINK ABOUT THOSE LATER YOU HAVE TO TAKE HIGHER ANTIALLERGIC.LIKE MONTUK LC ONE AT NIGHT FOR TWO DAYS THAN STOP IS NO SNEEZING, START AGAIN WHEN IT START TAKE FOR TWO THREE DAYS. ALWAYS WEAR A MASK.OTHER WISE IT CONVERTS INTO COPD. I HOPE YOU UNDERSTAND. O.K BYE.