If it's coccidiosis (coccidea) panacur won't do too much for you. Now will it decrease his appetite. The vet should have prescribed Albon for your beardie if he has coccidea. The Albon is a string antiobiotic that will kill the good gut flora while it flushes out the coccidium. Be sure to use a probiotic with it to replace this good bacteria in the tummy. Use Acidophiliz .
Please make sure you are 100% positive it is coccidea. If's its not and you use Albon your looking at a possibility for kidney diseases. Double check with your vet, and make sure they are good with herps. I don't see how you could give panacur for coccidea. Panacur is for worms like pinworms, roundworms, etc. It goes through the system and keeps the worms from grasping onto the tissue in the intestines, allowing them to come out the other end.
Along with your Albon and probiotic (acidophiliz ) your goin to want to keep the cage SPOTLESS! Only use essentials, and make everything disposable. Use cardboard for basking spot and paper towel that you should change 2-3 times daily. Coccidea have a direct life cycle and if they re enter the body there could be a stronger, more resistant strain. So its manatory that you keep the the cage VERY clean.
Also, keep the dragon well hydrated. Feed outside the cage only. If your beardie comes into contact with a cricket of some food, and doesnt eat it, pitch it and consider it affected for coccidea. Tehy are nastly little stinkers, and are tuff to get rid of.