Ketamine appears not to produce sedation or anesthesia in snails. Propofol produces anxiolytic effect, beneficial during medical procedures requiring sedation. This can be completed under local anaesthetic, sedation or general anaesthetic. Lorazepam is sometimes used as an alternative to midazolam in palliative sedation. This practice is known as sedation dentistry. Propofol is also used for procedural sedation. The pediatric sedation unit specializes in the safest techniques for pediatric sedation. When used before surgery, it reduces pain but results in greater sedation and visual disturbances. Deaths typically occur from complications related to excessive sedation and vomiting. Treatment for hyperthermia includes reducing muscle overactivity via sedation with a benzodiazepine. Dexmedetomidine can also be used for procedural sedation such as during colonoscopy. Symptoms at lower doses may include mild sedation and poor coordination. Examples of these kinds of effects may include anxiolysis, sedation, and hypotension. Patients who have had an endoscopy without sedation are able to leave unassisted. Overdose of flunitrazepam may result in excessive sedation, or impairment of balance or speech.