My son has been prescribed canasa suppositories and hydrocortisone rectal foam. They each seemed to help the first night and then did nothing on subsequent nights so he stopped using them. I am wondering if you need to build them up in your system before they start to work? Or are they supposed to work immediately -- so if not working not worth continuing? Also is there a reason why hydrocortisone foam would work better than canasa suppository or vica versa? What has been found to be most effective enema/suppository? Thank you!
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