Glad you asked...
Sedation of animals should not be done by anyone except a certified vet. You can calm your cat down though by petting him or her gently and giving them their favorite treat.
Then again, this answer might help you...
If you need to sedate your cat for medical reasons or to travel you will need to see a veterinarian first. The vet will give you the right amount of medication in a pill. The best way to get the cat to take it is to place it at the back of their throat.

