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I take both a steroid inhaler and Singulair and it works wonderful for me.  Thanks to this combination I have better control of my asthma than ever.  A bonus with the Singulair is that is has allowed me to have good control over my allergies too.   Yes, down feathers are an asthma trigger for me too.  I had to get used to cotton pillows.    Just my opinion here, but before you get rid of your pillows and mattress you might want to see how well the Singulair works.  It might work so well you won't need to make such changes.