Can losartan potassium cause insomnia if taken at night?

Yes, it might.: Losartan potassium might cause sleep disorders. However, it is reported in less than 2% of the patients taking it. If you plan on starting losartan, try it at any time, as the sleep disorder frecuency is very low. If you are already taking it at night, and have trouble sleeping, you can try changing the time in which you take it.