Some info.
Flubenol 15 works within hours of it being administered to your tank, but egg laying parasites will require further treatment as the eggs hatch into parasites. Items like camallanus worms and egg laying flukes may take up to 4 treatments at weekly intervals to ensure all the new parasites are attacked, by the time you see camallanus worms, the body cavity is already full of worms and eggs. Tapeworms and non egg laying flukes are killed first hit.