A party of doctors and nurses from a cash-strapped hospital used an ambulance as a taxi after a night out.
An investigation has been launched by health officials after witnesses saw staff from the Princess Royal Hospital in Telford climb into the ambulance after a drinking session on Sunday.
The incident came as the hospital is expecting to make cutbacks as part of measures to tackle a £30 million deficit faced by the Shrewsbury and Telford Hospital NHS Trust.
The economies, which may include job losses, have provoked public outrage and campaigners will gather in Telford on March 11 to protest.
Members of the public said 15 hospital staff spent five hours drinking at The Swan in Ironbridge; six of the group jumped into the back of the ambulance outside the pub at 11pm.
Steve Parry, spokesman for Shropshire Ambulance Service, said: "We carried out a preliminary investigation and obviously are not happy with the situation.
"The allegation is that nursing staff were in the pub and witnesses saw them taken away in the vehicle.
"Subject to an investigation it may be that disciplinary action will be brought against them if circumstances prove they brought the service into disrepute.
"As we understand it, patient services were not compromised as the vehicle was returning to its base in Telford."
Julia Buckley, hospital trust corporate management director, said: "Any unauthorised use of NHS facilities is completely unacceptable."