"levimisole is very effective particulary againsy callumanus worms"
i second this. really it doesnt matter WHICH med you use as long as it contains the right medication for the job. i also recommend you look for a med that contains metronidozole and praziquentil. if you can find a med with all three you cover a lot of bases (really depends on which type of worm it is...but if callamanus, prazi and metro are a bit better than lavamisol.
they can be difficult to get rid of, so second and sometimes thir drounds of meds are needed.
best of luck!
cheers