The 100 mg list is five gastrointestinal worms
The Emverm sentence names Ancylostoma duodenale and Necator americanus, both hookworms, plus Ascaris lumbricoides (roundworm), Enterobius vermicularis (pinworm), and Trichuris trichiura (whipworm). The age floor on that sentence is two years. A shorter phrase such as "worm infections" drops the species and the age.
Do not take Emverm with metronidazole (a medicine used to treat bacterial and protozoan infections) as serious skin reactions called Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) can happen. That limit sits next to the worm list. The tablet is not a partner for metronidazole.
The 500 mg list is roundworm and whipworm
VERMOX™ CHEWABLE is indicated for the treatment of patients one year of age and older with gastrointestinal infections caused by Ascaris lumbricoides (roundworm) and Trichuris trichiura (whipworm). The age floor there is one year. Pinworm is the worm people often mean when they ask for mebendazole, and that worm is on the Emverm sentence, not on this one. Hookworm is the same kind of gap. Using the 500 mg tablet as if it carried the 100 mg list borrows worms the sentence does not name.
How many tablets and how many days belong to each worm is the mebendazole 100 mg note. The medicine page is Vermox. The 100 mg text is the Emverm label. The 500 mg text is the Vermox Chewable label. How the drug was developed is mebendazole history.