The cetrizine tablets are known to cause drowsiness..so its better to take 1 tab after food at night.
You can take Tab. Levicertizine 5 mg instead it has lesser drowsiness effects..
Next Steps
You can take Tab. LEVOCETRIZINE 5mg instead
Health Tips
U can always resort to wearing a mask, keeping your surroundings dust free.. u will better prognosis.
Or please take a consult to get it diagnosed properly