Metronidazole is a medicine used to treat infections caused by bacteria, such as

trichomoniasis (an STI)
bacterial vaginosis (BV)
skin infections
digestive system infections

It is sometimes sold under names like Flagyl and Zidoval.
Metronidazole comes as a tablet or gel. This is called a topical treatment. If your infection is severe, the doctor may give you an injection instead.
If you need treatment for BV or an STI called trichomoniasis, you can buy Metronidazole here at Allschoolabs.
What is Metronidazole used for?
Metronidazole can be used to treat many different conditions. Here is a list of some of them:

bacterial vaginosis (BV)
trichomoniasis – an STI
rosacea
stomach ulcers (peptic ulcers)
giardiasis (infection in the small intestine)
pelvic inflammatory disease (PID)
gum and tooth infections
parasitic infections, such as amoebiasis
infections caused by bacteria (e.g. infected wounds or cuts)

Unless you need treatment for the first or second illness on the list, you can only get Metronidazole from your primary doctor.