Other parts of Huntsworth Health's offering, including medical communications and digital communications, will be rebranded.
The enlarged Tonic will continue to be based at its Victoria offices, headed by founders Scott Clark and Oliver Parsons. Both report to CEO Neil Matheson.
The agency was acquired by Huntsworth earlier this year for an initial payment of £3m (PRWeek, 13 July).
The reorganisation of the Huntsworth Health portfolio follows the restructure of the Huntsworth Group last month, which saw Trimedia merged with sister PR shop Grayling (PRWeek, 4 September).
The news also follows the resignation of longstanding Huntsworth Health CEO David Rowley (PRWeek, 7 October). Rowley resigned after eight years at the firm without a new job lined up. Huntsworth appointed Matheson to the role of CEO to replace Rowley.
Huntsworth Health's four service offerings cover medical communications, brand experience, PR and consulting and analytics.
The European Huntsworth Health medical communications teams will be rebranded as ApotheCom as part of the planned restructure. The European brand communications teams, together with Dorland Global Health Communications in the US, will form Nitrogen. Huntsworth Health Europe's digital offering will be rebranded as Nitrogen Interactive. Brand Health International will continue to be the main brand for the consulting and analytics offering.
Last week, PRWeek revealed rival marcoms group Chime Communications was merging its biotech PR agency De Facto into Good Relations, following the resignation of founder Richard Anderson (PRWeek, 16 October).