We Picked Up My Husband Pain Medication For His Back

We picked up my husband pain medication for his back on Friday. It looked different but they sometimes use different kinds. He has been vomiting a lot this weekend and we don't know if it's the flu or the new medicine. I went to look online to be sure this was the same medicine & can't find it listed anywhere!!! It does not come up on any of the pill ID sites. I am very worried. This is a credible pharmacy we deal with - or thought so. Thank you.