Not every online pharmacy recieves their medication from qualified vendors. Without knowing it, you may wind-up giving your pet medication that is counterfeit or that comes from unkown sources. In the event of a bad reaction to these products, consumers are left without the protection of the vendors and pharmaceutical companies and are stranded by the online pharmacy.
The FDA statement for online pharmacies can be found here.
According to the Environmental Protection Agency, these products are packaged to look like the brand name product, but they are NOT approved by the EPA for use in cats and dogs. They are frequently missing the required package inserts that contain important product disclosure information. Many do not have child-safety seals and often what is advertised on the box is NOT what is in the box.
Do not hurt your pet.
Although the price may look appealing, some online pharmacies (even with name recognition) are not FDA approved, nor do they adhere to pharmacy protocols.
Using counterfeit products not only could be dangerous to your pet, it could be fatal. Overdoses can occure if the ingredients do not get FDA oversight.
The EPA has created a place on their website to help consumers identify imposter packaging.
Internet Pharmacies are accredited by the National Board of Pharmacies. Please check to make sure your online pharmacy is listed.
http://www.nabp.net/ - Click on "Internet Pharmacies" on the left side of the screen, then click on "Buying Medicine Online".