Son with night time allergies

[latenight]

My son who is four is congested nearly every night. The doctor thinks it is allergies and it does improve with Claritin. She said to keep him on it as long as he is congested. He's been on it for a few months but as soon as we try and take him off he gets congested. Is there something else we can do rather than keep him permanently on an antihistamine?
Thanks

[miscdesign]

My son has allergies and we've had to re-do his room and bed because of it.  His bed has allergen reducing sheets on them (as do the pillows), comforters washed every week or use allergen reducing ones (there is a website, sorry I can't seem to recall what it is right now).  Absolutely no stuffed animals - carry dust.  If it can be helped, wood floor not carpeting - again holds dust.  He was constantly stuffy as well.  This has helped (not cured).  

[Trialanderror]

My son had similar problems for three months for no apparent reason. Turned out that we had a mouse in the house that left all kinds of furry and other traces. After "expediting" the mouse and doing some major cleaning all was well.

[Vickie418]

I would sure look into his room, too. Any types of dust or molds are really bad for my daughters asthma and allergies. We also have had our air/heater vents cleaned to make sure the air is not a problem either!