Can Botox Cause Loss of Smell and Taste?

Botox works on motor nerves (nerves responsible for movement) but not on sensory nerves, such as those for smell and taste.  So, there should be no loss of smell or taste after a Botox treatment.  

However it can cause an array of idiosyncratic reactions.  Loss of smell would be very unusual.  However I think you should bring your symptoms to the attention of your doctor.  This symptom warrants medical attention to determine the cause.