This paper proposes a two-sided monitoring algorithm of changes in the exponential family. We adopt a Bayesian approach which uses a loss function and takes into account the run length of the process. It also extends the monitoring scheme proposed in [Harrison, P.J., Veerapen, P.P., 1994, A Bayesian decision approach to model monitoring and Cusums. Journal of Forecasting, 13, 29-36.] The algorithm is illustrated with several examples, which analyze the power of the monitor. [ABSTRACT FROM AUTHOR]