Welchol Side Effects: Going into my second week and experiencing irratic sleeping, lowe http://www.medications.com/effect/view/33851 Going into my second week and experiencing irratic sleeping, lower back pain, occasional nausea and a lot of gas. I'm taking it for IBS and to lower cholesterol. I have also been taking a probiotic and something called chlorella, which is supposed to be o I would check your hemoglobin. I was on Welchol for about 1 -1/2 Sat, 18 Oct 2008 12:59:30 -0400 http://www.medications.com/effect/view/33851?item=13580 I would check your hemoglobin. I was on Welchol for about 1 -1/2 mopnths and now am anemic and have to see a gastro guy. http://www.medications.com/effect/view/33851?item=13580