1. Which drum(s) are the issue?
2. What does it sound like? How does it sound bad?
3. What do you want it to sound like?
4. What DAW are you working on?
5. What plug ins do you have available?
6. Any chance you can re-track the drums or use Sound Replacer and a sample library?
7. Post an audio sample?
...some more details may be helpful