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The dosage of drugs inside is hundreds of times higher than those used in regular healthcare and is "guaranteed" to be fatal, Dr Moore explains.

Most seemed to be unaware of the approved dosages.

So I talk with their doctor about what their needs are, the specific drugs they’re on and the dosage, any side effects, plus any other health concerns,” Sosa says.

It meant their dosage had been increased which, in turn, had exacerbated their compulsive behaviour - a process known as augmentation.

Through trial and error he realised that with the right dosage of pills he could plunge his wife into a sleep so deep nothing would wake her.