Weight-loss drug doubles the risk of depression and anxiety

A weight loss pill which was initially hailed as some kind of wonder drug is now thought to more than double the risk of depression, anxiety and suicidal thoughts.

The drug Acomplia has already been denied approval in the U.S. because of the increased suicide risk.

In the 18 months it has been available in Britain there have already been reports to the nation's drug regulator, the Medicines and Healthcare Products Regulatory Agency, of negative psychiatric reactions associated with the drug.

It is estimated that as many as 40,000 Britons use Acomplia and trials have shown that two out of five patients lose 10 per cent of their weight while taking it.

But new evidence suggests one in ten of those using Acomplia may develop side effects such as low mood, anxiety, irritability, nervousness and sleep disorders.

In July the European Medicines Agency concluded that, except for patients with major depression or those taking antidepressants who should not be prescribed it, the benefits of Acomplia outweighed the risks.

Other research however has found that anti- obesity drugs including Acomplia offer poor results in terms of weight loss.

While some lost less than five per cent of their body weight it was found that many remained significantly overweight or obese.

A scientific review of four randomised controlled trials involving 4,105 patients found those using Acomplia were three times more likely to stop treatment because of anxiety than those on a dummy drug and there was a 40 per cent higher risk of being harmed by "adverse events or serious adverse events" among those using the drug.

Acomplia (rimonabant) costs about £2 a day.

In the review, Professor Arne Astrup, of the University of Copenhagen found while patients on Acomplia on average lost 10lb or more after a year, than those on the placebo, they also had an increased risk of depressed mood disorders and anxiety.

The Danish researchers say doctors need to be alert to those potentially severe psychiatric adverse reactions.

Other research has found disappointing weight-loss results from anti-obesity drugs Acomplia, Xenical and Reductil, and the National Institute for Health and Clinical Excellence advises patients to stop taking anti-obesity drugs if they do not lose five per cent of their body weight in three months.

Adverse effects were recorded with all three drugs.

Drug company Sanofi who manufacture Accomplia says the meta analysis does not reveal any new data or any new evidence beyond what is already known by physicians or health authorities.

Sanofi says concern as to who should take Acomplia was in line with the firm's efforts' to ensure the medicine is not prescribed to patients with severe depression or on anti-depressive treatment.

Experts say the Danish findings are particularly significant because people with a history of serious depression or other psychiatric illnesses had been excluded from the studies.

The research is published in The Lancet medical journal.