Comparison of lidocaine preparations and their analgesic efficacy in epigastric pain

INTERVENTION: 10 ml of oral antacid (gastrogel: 500mg AlOH, MgSO3 240mg, MgOH24mg per 500ml) and 10 ml of lidocaine 2% viscous gel given as a one off oral dose together. These will be given as soon as the initial "pink lady" is prescribed by the treating clinician and the allocation has occurred or 10 ml of oral antacid (gastrogel: 500mg AlOH, MgSO3 240mg, MgOH24mg per 500ml) and 10 ml of lidocaine 2% solution given as a one off oral dose together. These will be given as soon as the initial "pink lady" is prescribed by the treating clinician and the allocation has occurred The randomly chosen arm is administered immediately and this equates to t=0 minutes The researchers are present from t=0 minutes to assess pain scores and platability. Although blinded to which arm is used they are able to ensure the intervention is given. Please note, the "pink lady", as described in the protocol, is the term used for 10ml of antacid (gastrogel in the the current context) and 10m lidocaine viscous. It may also be known as a "pink mix" CONDITION: Anaesthesiology ‐ Pain management dyspepsia ;indigestion;gastric pain; ; dyspepsia; ; indigestion ; gastric pain Emergency medicine ‐ Other emergency care Oral and Gastrointestinal ‐ Other diseases of the mouth, teeth, oesophagus, digestive system including liver and colon PRIMARY OUTCOME: analgesic efficacy in acute epigastric pain measured by change in visual analogue pain scale[60 minutes after the medication, a one‐off dose, has been administered] SECONDARY OUTCOME: analgesic efficacy in acute epigastric pain measured by change in visual analogue pain scale[30 minutes after the medication, a one‐off dose, has been administered] Bitterness of the three solutions, using a visual analogue scale[60 minutes after the medication, a one‐off dose, has been administered] Patient acceptability of the three solutions, using a visual analogue scale[60 minutes after the medication, a one‐off dose, has been administered] Taste of the three solutions, using a visual analogue scale[60 minutes after the medication, a one‐off dose, has been administered] Texture of the three solutions, using a visual analogue scale[60 minutes after the medication, a one‐off dose, has been administered] INCLUSION CRITERIA: • Adult patients 18 years and older. • Patients presenting to the emergency department with acute epigastric pain who are prescribed an antacid / lidocaine mixture.