Alot of pet medication on the supermarket shelf is for particular types of worms and for maintenance rather than treatment.. so for example.. the prazi dose on that product you mentioned is likely for maintenance of Tapeworm control taken once a month for example. This once a month dose is not designed for humans and not for treating a tape worm infection in humans. It will stop a Tapeworm growing taken once a month for example - but this stategy is something designed for dogs; not that it is unsafe, but its not a stategy that would kill a big Tapeworm in humans. The other drug in that product is something I'm unfamiliar with. I'm sad to tell you, u are wasting your time concerning yourself with that particular dog medication at this time in my view.
And, you don't know what's bothering you around your ribs. you aren't sure. Trying to advise you over the internet is so difficult because we don't know what you have. Personally, I started this whole adventure by passing an Ascaris and other worms by using a parasite herbal cleanse along with mebendazole. I have also passed a tapeworm megadosing on CoQ10 which is a very safe option for you if u want to tackle tape worm.
Doing something like a herbal parasite cleanse for 30 days and/or using mebendazole for Ascaris 3 days might produce something in the toilet for you which will help you get a positive ID of what you might have, and once you know what you might have, you can go from there in devising a strategy on what to do next. Many of us carry more than one species but Ascaris can be quite large so they are easy to spot. The other thing you can do is the cayenne pepper challenge to see if any tapeworm pieces come out. Hulda Clark e said most of us have tapeworm and usually there are no symtpoms whilst ascaris more usually have their presence felt more by vibrating.