Thanks for writing to health care magic.
Any person having loose motions should first be monitored for signs of dehydration
and this dehydration should be prevented.
To prevent dehydration you wife needs oral rehydration solution. You may also give any solution that contains sugar and salt.
Antimotility drugs like loperamide
reduce the intestinal motility and are not really indicated in a person with loose motions.
If there is blood in the stool then we consider dysentry
and antibiotics are advised.
Zinc and probiotics may be useful in a person with diarrohea.
Hope this helps.