The future of the title, which includes real-life stories and celebrity, is subject to an internal review, which is likely to take around a month.
B was relaunched in early 2005 under its then editor, Frances Sheen, following a complete revamp. After an initial sales spurt, it lost around 10 per cent of sales in the second half of the year, falling by 17,000 to 150,536.
The title's 20 staff have gone into a 30-day consultation period. The title is edited by Nina Ahmad, who replaced Sheen last year. The May issue of B goes on sale from 5 April.
The women's monthly magazine market continues to be hard hit by the launch of women's weekly glossies.
In the last Audit Bureau of Circulations figures, more than half of Hachette Filipacchi's UK titles reported drops. Last year, the publisher launched the women's title Psychologies, which recorded a debut ABC of 96,012.