Sara White (pictured), head of PR at Salix, will lead a team of three working on the account, supplemented by specialist media and medical associates where necessary.
Announcing the new client, the agency outlined how it has been tasked with helping to launch Britain’s first 'dayhab' clinic, which is scheduled to open in Acton, London, in May.
Tim Smith, chief executive of Help Me Stop, commented: "We were looking for an agency that combined an in-depth knowledge and understanding of the clinical and political landscape with a proven ability to raise profile rapidly and change public perceptions through the media."
He added: "Salix & Co scored on all counts and we look forward to developing a long-term partnership with them to support Help Me Stop’s ambitious vision."
The non-residential clinic will be able to treat alcoholics and drug addicts at a fraction of the price of a conventional rehab clinic, according to Help Me Stop.
It will cost £2,500 for a five-week course of treatment, compared to the company's estimate of £25,000 to be treated in residential rehab.
Help Me Stop claims that dayhab offers a more affordable, flexible and effective approach to recovery - allowing people to keep working, studying or living with their families - and has been proven to work in the US, it says.
The rehab programme will be overseen by Help Me Stop’s clinical advisor, Chip Somers (pictured), a former drug addict who helped Russell Brand come off heroin.
Salix will provide ongoing PR and stakeholder engagement support for the rehab firm, which is looking to establish a network of clinics across the UK over the next three years.
Angus Wrixon, head of growth at Salix & Co, said: "Historically support for people seeking help has been limited due to prohibitively expensive residential rehab or NHS and local authority services that can be difficult to access.
"At an average cost of £2,500 for five weeks’ intensive dayhab treatment, Help Me Stop will plug a much-needed gap."
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