Reference
Where these five molecules started
Each medicine on Gravix has a lab and a regulator attached to it. The notes below are those places, not a ranking of pharmacies.
Kitasato Institute
5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
Where Satoshi Ōmura isolated the soil actinomycete whose fermentation product became avermectin — the discovery that earned a share of the 2015 Nobel Prize in Physiology or Medicine and gave the world ivermectin.
Merck & Co. Research Laboratories
126 East Lincoln Avenue, Rahway, NJ 07065, USA
Where William Campbell's team refined avermectin into ivermectin; Merck later donated it as Mectizan for river blindness, one of the largest drug-donation programmes in history.
Janssen Pharmaceutica
Turnhoutseweg 30, 2340 Beerse, Belgium
The Belgian laboratories founded by Paul Janssen where mebendazole — long sold as Vermox — was discovered, giving primary care a simple oral cure for common worm infections.
Former Pfizer Discovery Laboratories
Ramsgate Road, Sandwich, Kent CT13 9NJ, United Kingdom
The Kent site where sildenafil (UK-92,480) was first trialled for angina, before an unexpected effect on erections redirected the whole programme toward erectile dysfunction.
ICOS Corporation (historic)
22021 20th Avenue SE, Bothell, WA 98021, USA
The Washington biotech that discovered tadalafil and partnered with Eli Lilly to bring the long-acting PDE5 inhibitor to market as Cialis.
Bayer AG (Wuppertal)
Aprather Weg 18a, 42113 Wuppertal, Germany
The German laboratories behind vardenafil, later sold as Levitra and as the orodispersible Staxyn tablet.
World Health Organization
Avenue Appia 20, 1211 Geneva 27, Switzerland
Keeper of the Essential Medicines list and the neglected-tropical-disease deworming programmes that shape how ivermectin and mebendazole are used at population scale.
U.S. Food and Drug Administration
10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
The regulator whose prescribing information and safety communications anchor the doses, warnings and interaction rules quoted on Gravix, including its statements on what ivermectin is and is not approved to treat.
Why the history matters
Provenance is not trivia. Ivermectin's origin in a single Japanese soil sample and a Nobel Prize explains both how good it is at what it was built for and why the overreaching claims deserve scrutiny; mebendazole's birth in the Janssen labs explains its quiet reliability against common worms; and sildenafil's start as a failed heart drug explains its cardiovascular cautions and its accidental fame. Each dossier links back to the institution that shaped the molecule.
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