Losartan can also cause frequent bowel movements.
This is seen in some patients.
However, there is another possibility that can be a parasitic infection.
Giardiasis can cause this type of symptoms sometimes.
IBS or iritable bowel sundrome also likely --in fact more likely besides losartan related effect.
I will suggest you to get a stool test to rule out any parasites first.
If no infection, then you can use Loperamide
( imodium) 2 tablets befroe going out to prevent these episodes.
Or you can opt for a different medication like amlodipine or metoprolol instead of losartan if the symptoms do not improve with loperamide.
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