The agency was awarded the business following an informal pitch and discussions with a number of agencies.
SFW will work alongside sister agency VCCP Health, which works on the £3m Omega Pharma creative account.
SFW will be responsible for CRM and eCRM activity to develop a launch, acquisition and long-term retention programme for the new product, which is under wraps.
Omega already produces market-leading brands such as Jungle Formula insect repellent, Buttercup Cough Syrup and antiseptic brand TCP.
Peter Worster, business director at SFW commented: "Omega appointed us based on our understanding of the challenge and the strategic and creative solutions we proposed. This is an exciting opportunity, and we are very much looking forward to working with them."
VCCP was handed Omega Pharma creative business in January last year, following a competitive pitch, managed by The Haystack Group.