Praziquantel: AquaCura Prazi-Cura Dosage

Normally I purchase API general cure, however, I wanted to try out pure medications this time. I’ve seen some dosing recommendations on the site but they are for PraziPro. However, this time I purchased Aqion AquaCura Prazi-Cura which is 98.5% Praziquantel. So I wanted to know how much to use in my 120 Gal tank.
Also, I have been reading about Metro and read that it only last for 8 hours once applied to water or food. Is Praziquantel the same? I wanted to know so that I can plan out the water changes

Thanks