United Drug, which acquired healthcare and pharmaceutical events specialist World Events Group in a £16.2m deal in November, said the companies would merge from 1 March.
Some staff within the business, which will be known as Universal World Events, have entered into a consultation period as a result of the merger, which will cause a duplication of roles in some service departments.
The consultation period is set to conclude in the next two to four weeks.
Universal Procon managing director Graham McIntosh said: "There are a number of vacancies across both businesses as a result of new business wins and, where possible, these positions will be filled internally to minimise the incidence of redundancies."
There would be no changes to any of the merged agencies’ client-facing event teams, he added.
Martin Parry, who will remain on the board, told C&IT: "In the World Events teams we are pursuing new business opportunities."
The agency is in negotiations with a major global pharmaceutical client, he said, which could see the appointment of additional client-facing staff.
Universal World Events will specialise in serving the healthcare sector and is expected to have a combined turnover of almost £100m.
It will have 250 employees in offices in the UK, Netherlands, Germany, France, Italy, the US, Hong Kong and Singapore.
The company will operate in the UK out of offices in Cleckheaton, Ashby de la Zouch and London.
Graham McIntosh will become managing director of Universal World Events and Martin Parry will remain on the board.
The team will also include Mark Saxby as sales and marketing director, Andrew Winterburn as European director and Jeremy Wilson as finance director.