Hey Susie,
They can definately be taken together. I did 400mg of Doxy for 4 months and 2g of Rocephin twice weekly for 6 weeks. My wife did the same. No problems other that some tiredness at the begining from the Rocephin, but it fades. Your in good hands with Dr. K, he's not able to treat as aggresively as the true LLMD's, but I feel that he is by far our best option as a doc here in Florida. Good luck with your treatment, I hope you feel better soon. Jeff