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Experts have warned about the dangers of anti-anxiety ‘benzo’ drugs for decades.

Joe O'Connal/The Canadian Press

When Shirley was handed a three-month prescription for Ativan, her doctor insisted the popular sedative was just an "innocent little thing" to help her sleep.

But after her doctor yanked her off the drug cold turkey, rather than slowly tapering off the dosage as experts typically recommend, Shirley plunged into a deep withdrawal. Over the next year and a half she was cycled through more than a dozen benzodiazepines and antidepressants, locked up in a psych ward and diagnosed with a slew of mental disorders.

Unable to work or sleep and gripped by a relentless, gnawing fear, Shirley contemplated the most painless way to end her life.

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"I had a very decent job, a good family and wonderful kids, and suddenly I just find I want to kill myself," says the 40-year-old Hamilton, Ont., public servant, who doesn't want her real name used. "I didn't know how to go on."

Researchers, academics and clinicians have been warning about the dangers of benzodiazepines – pills prescribed for anxiety or as sleeping aids that include such names as Xanax, Valium, clonazepam and Ativan – for decades.

But despite the risks, "benzos" continue to be widely used across Canada – about four million prescriptions are filled annually in Ontario alone – a trend that experts say raises concerns about the way drugs are monitored once they're on the market and the lack of awareness about their potentially fatal side-effects.

Data compiled from Health Canada's public database of adverse drug reactions suggest that four of the most commonly prescribed benzodiazepines – lorazepam, alprazolam, clonazepam and diazepam – have been implicated in nearly 200 deaths in the past decade.

This is likely a conservative number, as experts estimate that only 3 to 5 per cent of adverse reactions are reported.

"People are on these things all over the country," says Dr. James Silvius, a University of Calgary professor who specializes in care of the elderly.

"We need to have conversations with prescribers about these drugs and how they're used. But the biggest conversation we need to have is actually with the public, to get perceptions changed that these are safe drugs to take."

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Benzodiazepines are tranquillizers that work by suppressing the central nervous system. They were first marketed in the 1960s as a safer alternative to barbiturates, quickly becoming a popular treatment for everything from insomnia to alcohol withdrawal to the stresses of everyday life.

But by the 1980s, warnings about dependence and serious side-effects began to surface.

Adverse reaction reports filed to Health Canada document wide-ranging risks, including memory loss, over-sedation and suicidal thoughts.

However, Health Canada cautions that the reports – filed on a voluntary basis by doctors, pharmacists or members of the public – don't prove that the drug caused the side-effect reported; it's just the suspicion of the person filing the report.

Even so, benzodiazepines can cause death if taken in large quantities or if mixed with other drugs or alcohol.

Researchers and doctors say insufficient monitoring of drugs once they have been approved is allowing such problems to go unchecked.

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A recent Senate report called on Health Canada to shift spending away from pre-marketing trials toward post-marketing surveillance.

While some provincial governments, including Ontario and B.C., have begun tracking benzo use, others like Alberta don't include the drug in monitoring efforts.

The variety of approaches from one province to the next means there are no national statistics on use of the medications. However, government-funded insurance programs, which cover the cost of some prescription drugs for eligible patients, give us a glimpse into their usage.

From 2007 to 2012, the number of First Nations people getting benzos covered by a Health Canada drug plan jumped by about 15 per cent – to more than 70,000 from about 60,800 – an increase slightly higher than overall program growth.

But Health Canada says the average daily dose prescribed to patients during that period rose by about 13.3 per cent.

"This suggests prescribers are tending to prescribe higher dosages of this medication when it is prescribed," Health Canada spokesman William Wells said in an e-mail.

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Another indicator of how widely benzodiazepines are used comes from figures on seniors.

Roughly 19 per cent of those aged 65 to 74 on drug benefit programs in six provinces are on benzos, according to a 2010 report by the Canadian Institute of Health Information. For those over 85, the figure jumps to almost 25 per cent.

Benzodiazepines can be helpful for short-term or occasional use, such as helping to quell a panic attack. Pfizer Canada, the maker of Ativan and Xanax, says the drugs have benefited millions of people who suffer from anxiety.

Adverse reactions linked to benzodiazepines

Adverse reaction reports are voluntarily filed to Health Canada by doctors, pharmacists or members of the public when a person experiences a side-effect while taking a drug.

Although summaries of the reports are publicly available through an online database, the more complete, detailed reports outlined below were obtained from Health Canada through Access to Information requests.

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The health regulator cautions that the reports don't prove causality: The role that the drug played is only the suspicion of the person filing the report.

  • A 47-year-old man died in his bed after taking alprazolam, the generic form of Xanax, and codeine to treat a broken leg. A report submitted to Health Canada in 2010 describes his death as accidental, the result of “acute multi-drug toxicity.”
  • A 31-year-old woman reported more than a dozen side-effects – among them suicidal thoughts, amnesia, lethargy and disorientation – while taking diazepam and lorazepam, the generic forms of Valium and Ativan respectively, in June, 2011.
  • A woman became dizzy and anxious after taking a dose of Ativan. A report filed with Health Canada in January, 2012, says the 38-year-old couldn’t walk in a straight line and almost stepped into traffic.
  • A 63-year-old woman landed in hospital after experiencing an “acid trip” while taking Valium in March, 2012.
  • A man, 61, reported experiencing amnesia, lethargy and an inability to work after becoming addicted to diazepam in October, 2007.
  • A woman reported having six seizures within 30 minutes while taking alprazolam in March, 2001. The 38-year-old also experienced difficulty speaking, poor balance, confusion and headaches. She was taking three 0.25-milligram tablets of alprazolam a day.
  • A 44-year-old woman died from a decrease in oxygen to her brain after overdosing on diazepam in 1996. A postmortem exam was unable to determine whether the overdose was intentional, but documents say she had not appeared to be depressed, nor had she spoken about committing suicide to her doctor or her family.

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