Remove All stored procedure (SP) in DB use query

use <db Name>
Go

declare @procName varchar(500)
declare cur cursor

for select [name] from sys.objects where type = 'p'
open cur
fetch next from cur into @procName
while @@fetch_status = 0
begin
    exec('drop procedure ' + @procName)
    fetch next from cur into @procName
end
close cur
deallocate cur