SELECT 
   SCHEMA_NAME(SCHEMA_ID) AS [Schema]
  ,SO.name AS [ObjectName]			   
  ,SO.Type_Desc AS [ObjectType (UDF/SP)]
  ,P.parameter_id AS [ParameterID]
  ,P.name AS [ParameterName]
  ,TYPE_NAME(P.user_type_id) AS [ParameterDataType]
  ,P.max_length AS [ParameterMaxBytes]
  ,P.is_output AS [IsOutPutParameter]
FROM sys.objects AS SO
INNER JOIN sys.parameters AS P ON SO.OBJECT_ID = P.OBJECT_ID
WHERE SO.name = 'stored_procedure_name'
ORDER BY [Schema], SO.name, P.parameter_id