"Was I given the wrong prescription?"

I went to see a doctor at Sheffield Woodhouse health centre, as I had loads of problems. But I was told that they had no time, and we would have to talk about it next time. I said well that's why I'm here to sort it out now. I've had mouth ulcers for nearly a year and wanted to sort it out, cos they are very painful. The doctor printed me something from the internet and gave me a prescription for Aciclovir. When I got home, I started to read what was printed for me - it was completely different from what I went for. The doctor printed me information about cold sores and cream, but prescribed me a drug that should be put in the mouth. That doesn't make sense.