NOOOO!
Don't ever, ever, ever give your bird any type of "anti-parasitic" medicine except something that is given to him by an Avian Vet!!!! And never, ever, ever use any of those anti-parasitic products that are sold in pet shops around your bird, such as those things you are supposed to hang on their cages for mites and such! First of all, they don't work. And your bird does not ever need to be wormed or anything of the such on a "precautionary" basis. Never.
Second of all, birds are extremely sensitive to everything, and most-all anti-parasitic substances consist of literal poisons/toxins, most of which can very quickly kill your bird.
Just because your bird came from a pet shop does not at all mean he has any type of "parasites", such as mites. Only if you seen him exhibiting signs/symptoms of chronic itching/scratching should anything be done like this (birds do not need to ever be dewormed by the way), and at this point you only take them to a Certified Avian Vet. Never ever self-medicate your bird!
***I don't know if you've ever owned a pet bird/parrot before or not, but it doesn't sound like it, so something that you really need to understand and listen to for the next 30-40 years that you hopefully have your Green Cheek: BIRDS ARE NOT AT ALL LIKE DOGS, CATS, RODENTS, ETC. They are extremely sensitive to medications, supplements, fumes, scents, oils, etc. They can go from being perfectly healthy to dead in an instant, particularly from being given any type of medication, anti-parasitic substance, etc. And I'm not trying to "shout" at you by typing this, but simply to emphasize this: YOU SHOULD NEVER, EVER TREAT YOUR BIRD WITH ANY TYPE OF OVER THE COUNTER MEDICATION OR SUBSTANCE YOU BUY AT A PET SHOP FOR PARASITES, WORMS, ETC. NOR SHOULD YOUR BIRD EVER BE TREATED ON A "PRECAUTIONARY" OR ON A "JUST IN CASE" BASIS!
Now every bird that you bring into your home, whether a young baby you buy from a breeder or pet shop, or an adult that you adopt from a rescue or private individual, should be scheduled for a "Wellness Exam" with either a Certified Avian Vet or an Avian Specialist within the first couple of weeks of bringing him home. During this visit the Avian Vet with do a complete physical exam, which includes looking at his feathers, skin, cere, etc. for different types of mites and other parasites. This is not like bringing a puppy or a kitten home and running out to the pet store and buying a flea and tick medication to put on them to PREVENT fleas, ticks, etc. You don't do that with birds. You only treat them for an illness, infection, parasite, injury, etc. when it occurs, and you never can treat them on your own, at home, with medications that you buy over the counter at a pet shop or online. You must take them to only an Avian Specialist Vet (no general or Exotic Vets), as you can easily kill them by trying to treat them with medications on your own. And certainly not with anti-parasitics. They do not contract fleas, ticks, etc. like dogs and cats do. And like I said, if your bird has something like feather-mites or scaly-face mites, he'll be itching and scratching himself constantly, and this needs to be seen immediately by an Avian Specialist and treated with a medication that is specifically formulated for birds!
I'm very glad that you asked this question here, hopefully before you gave your bird anything or put anything on him, because this is a totally different situation than any other type of pet that you may have owned.
