The goal of this clinical trial is to assess if intravenous administration of linisol reduce the propofol consumption and the sides effects of sedation during gastroscopy in healthy patients (ASA 1 and 2 patients).

Prior to propofol sedation, participants will receive either an intravenous bolus of linisol (1.5 mg/kg) = treated group or placebo = control group.

After the gastroscopy, patients will be asked to complete a satisfaction questionnaire

Inclusion Criteria:

• Patients scheduled for gastroscopy under narcosis and who have signed the consent.
• ASA score: 1 and 2
• BMI between 18 and 30 kg/m2

Exclusion Criteria:

• Lidocaine allergy
• Anesthesia within the last 7 days
• Use of local anesthesia in the last 24 hours
• Rhythm disorder or HR <50
• Pregnant women and breastfeeding
• Participation in another clinical study in the last months
• Cannot understand VAS score or French
• Severe central nervous disease and mental illness.
• obstructive sleep apnea (known or STOP BANG score >5)
• Upper lung infection.
• Liver or kidney function disorder

computered randomisation, sealed enveloppes linisol versus placebo prepared by anesthesist not involved in the study or in patient care