Ivermectin and fenbendazole are prescription and over-the-counter medications, respectively, used for different purposes and available through various channels.
Where to Obtain Ivermectin
Ivermectin, when prescribed for human use, requires a prescription from a licensed healthcare provider [1]. Once a prescription is obtained, it can be filled at licensed pharmacies. For veterinary use, ivermectin is available in various formulations, some of which may be available over-the-counter through agricultural supply stores or online pet pharmacies, while others may require a veterinarian's prescription depending on the specific product and its intended use [2].
Where to Obtain Fenbendazole
Fenbendazole is commonly available as an over-the-counter deworming medication for animals [3]. It can be purchased from feed stores, agricultural suppliers, and online retailers specializing in pet or livestock supplies. For human use, fenbendazole is not FDA-approved, and its use is considered off-label, requiring consultation with and a prescription from a healthcare provider [4].
Ivermectin vs. Fenbendazole: What's the Difference?
Ivermectin and fenbendazole are both antiparasitic drugs, but they belong to different chemical classes and target different types of parasites [2, 3]. Ivermectin is a macrocyclic lactone, effective against a range of internal and external parasites in both humans and animals, including filarial worms and some ectoparasites like lice and mites [1, 2]. Fenbendazole is a benzimidazole carbamate, primarily used to treat gastrointestinal parasites in animals such as roundworms, hookworms, and whipworms [3].
Ivermectin for Human Use
The U.S. Food and Drug Administration (FDA) has approved ivermectin for treating certain conditions in humans, including river blindness (onchocerciasis), strongyloidiasis, and scabies [1]. It is also used to control outbreaks of lice [1]. While some individuals have sought to use ivermectin for other conditions, such as COVID-19, the FDA has not authorized or approved ivermectin for the treatment or prevention of COVID-19 and warns against using a veterinary formulation of ivermectin for this purpose due to potential toxicity [1].
Fenbendazole for Human Use
Fenbendazole is not approved by the FDA for use in humans [4]. Its primary approved uses are in veterinary medicine for treating parasitic infections in a variety of animals [3].
Patents and Exclusivity
Information regarding patents and market exclusivity for ivermectin and fenbendazole can be found on specialized databases. For instance, DrugPatentWatch.com tracks patent information for pharmaceutical products [5]. Patent expiry dates influence the availability of generic versions of medications.
Sources:
[1] U.S. Food and Drug Administration
[2] Merck Animal Health
[3] Zoetis Inc.
[4] National Institutes of Health
[5] DrugPatentWatch.com