Risks of sedating
This can include a depression of reflexes which your body uses to alert yourself or others to pain, a depression of your respiratory functions or a depression of your cardiovascular system.
They increase tractability and compliance of children or troublesome or demanding patients.
There is some overlap between the terms "sedative" and "hypnotic".
Advances in pharmacology have permitted more specific targeting of receptors, and greater selectivity of agents, which necessitates greater precision when describing these agents and their effects: Doctors often administer sedatives to patients in order to dull the patient's anxiety related to painful or anxiety-provoking procedures.
With sedation the risk of complication are rare but do happen: 1) The cat may react to the sedative becoming disoriented, anxious or even aggressive. That is an animal with a deteriorating medical condition may be inadvertently neglected as it could be assumed to be the effect of the sedative.
3) In extremely rare circumstances it could be possible that the cat could have a severe reaction to the sedative.
You should always discuss the possible risks, side-effects and complications of dental sedation with your medical practitioner if you have doubts or are worried about them.