Pfizer is due to cut 90 jobs next year when it closes two research and development sites, according to the BBC.
Staff were told on Monday the drugs maker would be restructuring its operations, leading to 50 redundancies at its factory in Slough, Berkshire, and another 40 in Gosport, Hampshire.
Overall, Pfizer aims to reduce the number of its scientists by 15%.
The firm said in a statement: “While these changes are expected to bolster productivity and reduce costs, they will result in staff reductions.
“Pfizer is committed to supporting affected colleagues, their families, and the affected communities through this transition.”