Is an injectable treatment that dissolves fat cells, to reduce small areas of excess fat. A synthetic form of deoxycholic acid that is an approved injectable to permanently treat submental fat, commonly called a double chin . How many sessions are needed ? Depending on the initial assessment , the accurate number of sessions can be given , most people need 3-4 treatments every 3-4 weeks. Is it painful and is there swelling ? Most describe it as uncomfortable with tingling / burning and swelling but this can be reduced during treatment with local numbing , ice application and tylenol use. Yes there is some swelling but down time is mostly minimal , with most being able to continue normal activities the next day.