I was prescribed this medication on Thursday, 10/23. Ater taking my first dose, I immediately threw up. I read that this was a common side effect and thought nothing of it. I was fine after the 2,3, and 4th dose. Then I took the 5th dose on Monday night and woke up around 1:30 A.M. with severe burning and tingling in my feet. I put some muscle rub on it, and figured it was unrelated. I stand on my feet all day as a teacher and just thought my feet were tired. After taking the 6th dose, I once again woke up around 1:30 AM with very severe pain in my knees. I was in tears over the severity of this pain. Even now, my knees and feet are still hurting and tingling. I called the doctor today to see about getting my prescription changed, even though I only had 4 pills left to take, and she asked me to come in and be evaluated. Another co-pay, when they shouldn't have given me this poison to begin with! I am 24 years old, and have to take care of an 8 month old baby. My husband is scared out of his mind and so am I. I am way to young to have to deal with joint pain, and am praying that this isn't permanent damage!