I did not use l-ornithine for my first few flushes either, because it is an amino acid and therefore sold under the counter here in Canada. I have used Valerian tincture instead, that's a relaxing and sleep inducing herb you should find in Australia. I use abt 25 to 30 drops for a flush. In the meantime I have found l-ornithine. I find it equals the valerian in effectiveness.
Wishing you a good flush!