article in the Telegraph
"The National Patient Safety Agency (NPSA) said that almost 500 patients in total have received the wrong dose of the drug, called midazolam, over the past four years.
Midazolam is used to sedate patients before minor procedures, including setting broken wrists and dentistry.
The medication hit the headlines in 2000 when a male nurse was convicted of killing a colleague after drugging her with midazolam.
As well as the three deaths another 48 patients had been "moderately" harmed by receiving large doses of the drug in the past four years, the NPSA said.
The watchdog, part of the NHS, also warned that health professionals were frequently relying on a reversing agent to bring people around after they had been over-sedated.
The drug works by slowing down both the heart and lung rate, and can cause a heart attack or lung problems if given in very high doses.
The NPSA said that it had received 498 reports of patients being given the wrong dose of midazolam between November 2004 and November 2008.
It warned that patients were being given whole containers, or ampoules, of the drug instead of just a small amount.
"The presentation of high strength midazolam as a 5mg/ml (2ml and 10ml ampoules) or 2mg/ml (5ml ampoule) exceeds the dose required for most patients," the watchdog warned in a statement.
"There is a risk that the entire contents of high strength ampoules are administered to the patient when only a fraction of this dose is required.
"There is frequent reliance on injectable flumazenil (antagonist/reversing agent) for reversal of sedation in patients that have been over-sedated."
The NPSA called for high-strength midazolam to be removed from many parts of hospitals."