Can there be complications from miraDry? Is it permanent? How many treatments are needed?

miraDry can permanently stop excessive underarm sweat, odor & hair in as little as one treatment. It an FDA-cleared, safe, nonsurgical treatment that works by releasing theral energy to eliminate bothersome sweat glands in your underarms. It will not cause you to sweat more in other areas. miraDry is currently not approved for use on the feet. Common symptoms post procedure include bruising and swelling at the treatment site. Thank you for your question, best of luck to you!

Their is no serious complications from doing MiraDry, but their are some common symptoms that occur.  Namely, bruising, swelling, pain, numbness and even little burns if you have any skin tags or moles in the armpits.  Some of these symptoms can persist for a few weeks or months, but all resolve without any serious complications.  
Number of treatments required depend on how severe your excessive sweating has become.  I tell patients that about 85-90% of improvement is seen with just one treatment and it is permanent.   That is enough for many people, but some with severe hyperhidrosis require a 2nd and very rarely a 3rd treatment.  
Cost is about $2000 for the treatment and much cheaper if you need another session.  
It will not make you sweat more from other areas.  You will sweat normally everywhere but the axillae. 
It can’t be used to treat any other sweating areas, except the under arms.