No, Myrbetriq isn’t known to cause dementia.
A class of drugs called antimuscarinics (sometimes called anticholinergics) has been found to increase the risk of dementia in older people. Like Myrbetriq, antimuscarinics are used to treat overactive bladder. But Myrbetriq isn’t an antimuscarinic, and it’s not known to have this risk.
If you have any concerns about dementia during your Myrbetriq treatment, talk with your doctor.