Approval from the National Health Service (NHS) may falsely reassure patients, many of whom are increasingly opting to fund their own treatment in the face of overstretched mental health services and the associated lengthy waits, researchers said.
Until such time as evidence is forthcoming on the clinical effectiveness of these apps, and they have been properly evaluated, such apps should be removed from the NHS library, said Simon Leigh from the Management School at the University of Liverpool, and Steve Flatt, from Liverpool Psychological Therapies Unit Community Interest Company.
One in six of those waiting for treatment is expected to attempt suicide, while four in 10 is expected to self-harm. And their condition is likely to worsen in two thirds of those waiting to see a mental health professional.
Interactive online and app based treatments for mental health are becoming increasingly popular and accessible as a result of the growth in routine use of smartphones and tablets, researchers said.
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But in 2013, there were only 32 published articles on apps for depression, one of the most common mental health conditions, despite the availability of more than 1500 for download, they said.
The same is true of apps for a range of other mental health issues, including bipolar disorder, bulimia, and post-traumatic stress disorder, which suggests that they don't meet these standards.
"Unfortunately, the situation seems to be much the same with respect to apps accredited by the NHS," researchers wrote in the journal Evidence Based Mental Health.
"As such, confidence in, and the validity of, the claims made by apps that fail to apply such metrics must be considered as low at best, suggesting that the true clinical value of over 85 per cent of NHS accredited mental health apps is at present impossible to determine," researchers said.