All Emergencies - Basic life support principles:

1. Maintain an airway
2. Assess breathing
3. Monitor circulation

Management of sedative overdose:

1. Terminate dental treatment.
2. Position the patient.
3. A-B-C Airway, Breathing, Circulation - Basic life support.
4. Definitive Care:
   1. Get medical assistance, if needed.
   2. Administer oxygen
   3. Monitor vital signs
   4. Benzodiazepine overdosage may be reversed by administering flumazenil IV, IM or sub-lingual.
5. Recovery
   1. If profound with emergency personnel required, transport and stabilization at hospital may be required.
   2. If less severe and managed, procedure may resume.

Source: Sedation, A Guide to Patient Management by Stanley F. Malamed