Is Lack Of Appetite A Side Effect Of Vizylac ?

my husband recently (4 dec,2010) has gone under byepass surgery he is having vizylac along with metolar xr37.5mgtwice a day,clopitab ods,monotrate1o tds but he does not feel hungary finds difficulty in having food feels nausea I want to know whether this is the side effect of vizylac should he stop takinf vizylac