DROP INDEX IF EXISTS for mysql|Mysql drop index if exists.

Mysql version upto 5.6, No straight-forward way to DROP INDEX using IF EXISTS.

Try this,

create procedure DeleteIndex()
begin

IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA.STATISTICS  WHERE TABLE_NAME = 'TableName'
            AND INDEX_NAME = 'IndexName' AND INDEX_SCHEMA='DbName') THEN
   ALTER TABLE  TableName DROP index THead2;
END IF;
END