The fishben comes I packets of 250mg each. The recommended dose of fen is 10mg/k/ day divided into two doses for 5 days every two weeks. Some take half those dose on a daily basis. For a 70k person, that would be 350mg per dose. Fen is also available as horse paste called Safeguard or Panacur and as a drench (throat drench) for goats. Those who use the fish version do so because it is more pure, without parabens. Not sure if parabens are a big problem but it f cost is a factor, the goat version is cheapest per dose. You can also mix the goat liquid or horse paste in DMSO or other carrier for use on skin. Fen can be used in combination with Prazi.