Does Galantamine Cause Nausea And Vomiting?

my husband is taking galantamine at 8am every day before breakfast. For about 3 months he gets nausea and vomiting about every 3 or 4 days. He has PD and takes sinemet and comtan, 7 times a day. Could the galantamine be causing the nausea, he has no temperature and does not have the flu or any other sympthons other that gets very nausea.