  We study the energy loss of excited monopolium in an atomic medium. We
perform a classical calculation in line with a similar calculation performed
for charged particles which leads in the non relativistic limit to the
Bethe-Bloch formula except for the density dependence of the medium, which we
do not consider in this paper. Our result shows that for maximally deformed
Rydberg states the ionization of monopolium in a light atomic medium is similar
to that of light ions.
