For those who have read my endless series of blogs on cardiovascular disease, you may know exactly where I am going at this point.
Some time ago, Pfizer were developing a drug to treat angina. It blocked an enzyme called phosphodiesterase type-5. [Although I believe that its exact mechanism of action was not known at first]. To put it another way, this drug was a phosphodiesterase type-5 inhibitor (PDE5i).
The moment Pfizer found out what enzyme this drug blocked, they tried to patent the pathway that blocked this enzyme. Pharmaceutical companies trying to patent biological pathways. Perhaps I should try to patent the Krebs cycle, and charge everyone on the planet for having such a thing. Kerchingggg!
‘The U.S. patent office appears to have granted Pfizer a patent covering any drug that blocks this enzyme, meaning that it can sue all of its potential competitors.’1
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