I may be wrong about this, but I believe I have observed FAR MORE than 400 'eggs' in the equivalent of a 'teaspoon' of fecal matter.
Praziquantel and quinine seem like two fine drugs choices to me. However, one must make SURE what kind of parasitic infestation [and load] will be treated this way FIRST. Be VERY careful. I have witnessed seasoned doctors make rather basic and dangerous mistakes while using/dosing these drugs.